El correo electrónico (masivo) no llega. No está claro por qué

Question

Tengan paciencia mientras intento explicar el problema lo mejor que puedo (el inglés no es mi lengua materna).

Uno de mis clientes ofrece un programa de entretenimiento en línea dirigido a empresas cuyos empleados necesitan trabajar desde casa debido a la pandemia de Corona. Esto se transmite en vivo a través de YouTube. Cada espectáculo está diseñado para la empresa que solicita el espectáculo.

Cuando una empresa se inscribe en un espectáculo, debe enviar una lista con las direcciones de correo electrónico de los empleados que desean asistir al espectáculo en línea.MiLuego, el servidor de correo envía un correo electrónico estándar (en nombre de mi cliente) a cada empleado con un pequeño texto que presenta el programa y un enlace a una transmisión de YouTube.

He hecho todo lo que se me ocurre para asegurarme de que llegue el correo:

Agregué un registro SPF al DNS de mi cliente para informar al servidor de correo receptor que mi dominio está autorizado para enviar correo electrónico en nombre de mi cliente. Agregué un registro DKIM. Agregué un registro DMARC.

Antes de enviar la campaña de correo electrónico, siempre hago que mi servidor envíe una muestra a mail-tester.com. Siempre obtengo una puntuación perfecta de 10 sobre 10:

Aun así, la mayoría de las veces un pequeño porcentaje del email enviado, no llega. Aunque todo el correo se envió a direcciones de correo electrónico en el mismo dominio (del cliente). Lo atribuyo a que las personas eliminan accidentalmente el correo, o tal vez tienen un escáner de virus hiperactivo en su sistema.

De todos modos, ayer necesitaba enviar una campaña de correo electrónico a los empleados del cliente de mi cliente. Ninguno llegó. Lo intenté una y otra vez y no llegó ninguno. No tengo idea de por qué. Copié una parte de las líneas relevantes de mi archivo de registro mail.info. No sé exactamente cómo leer el archivo de registro, pero no veo ningún error aparente.

Cambié los nombres de dominio de la siguiente manera:

• onlineentertainment.com es la empresa de mi cliente
• mymailserver.com es mi servidor de correo
• destinatariodomain.com es el nombre de dominio de la empresa a la que intento enviar correos electrónicos a los empleados.

¿Alguien puede ver lo que podría estar pasando aquí?

Dec 16 23:54:37 enterprise postfix/pickup[39522]: 7B6595F979: uid=33 from=<[email protected]>
Dec 16 23:54:37 enterprise postfix/cleanup[2761]: 7B6595F979: message-id=<[email protected]>
Dec 16 23:54:37 enterprise postfix/qmgr[41828]: 7B6595F979: from=<[email protected]>, size=4113, nrcpt=1 (queue active)
Dec 16 23:54:37 enterprise postfix/pickup[39522]: D03835F97D: uid=33 from=<[email protected]>
Dec 16 23:54:37 enterprise postfix/cleanup[2761]: D03835F97D: message-id=<[email protected]>
Dec 16 23:54:37 enterprise postfix/qmgr[41828]: D03835F97D: from=<[email protected]>, size=4133, nrcpt=1 (queue active)
Dec 16 23:54:38 enterprise postfix/pickup[39522]: 313375F97E: uid=33 from=<[email protected]>
Dec 16 23:54:38 enterprise postfix/cleanup[2761]: 313375F97E: message-id=<[email protected]>
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: 313375F97E: from=<[email protected]>, size=4141, nrcpt=1 (queue active)
Dec 16 23:54:38 enterprise postfix/smtpd[3133]: connect from localhost[127.0.0.1]
Dec 16 23:54:38 enterprise postfix/smtpd[3133]: 4B5CC5F977: client=localhost[127.0.0.1]
Dec 16 23:54:38 enterprise postfix/cleanup[2761]: 4B5CC5F977: message-id=<[email protected]>
Dec 16 23:54:38 enterprise postfix/smtpd[3133]: disconnect from localhost[127.0.0.1] ehlo=1 mail=1 rcpt=1 data=1 quit=1 commands=5
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: 4B5CC5F977: from=<[email protected]>, size=5132, nrcpt=1 (queue active)
Dec 16 23:54:38 enterprise amavis[34564]: (34564-15) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 92QAoDnqQmRn, Hits: -2.099, size: 4622, queued_as: 4B5CC5F977, dkim_sd=202011:onlineentertainment.com, 808 ms
Dec 16 23:54:38 enterprise postfix/smtp[2762]: 7B6595F979: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.82, delays=0.01/0/0/0.81, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 4B5CC5F977)
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: 7B6595F979: removed
Dec 16 23:54:38 enterprise postfix/pickup[39522]: 877355F97F: uid=33 from=<[email protected]>
Dec 16 23:54:38 enterprise postfix/cleanup[2761]: 877355F97F: message-id=<[email protected]>
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: 877355F97F: from=<[email protected]>, size=4112, nrcpt=1 (queue active)
Dec 16 23:54:38 enterprise postfix/smtpd[2771]: 9D4475F979: client=localhost[127.0.0.1]
Dec 16 23:54:38 enterprise postfix/cleanup[2761]: 9D4475F979: message-id=<[email protected]>
Dec 16 23:54:38 enterprise postfix/smtpd[2771]: disconnect from localhost[127.0.0.1] ehlo=1 mail=3 rcpt=3 data=3 noop=1 quit=1 commands=12
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: 9D4475F979: from=<[email protected]>, size=5162, nrcpt=1 (queue active)
Dec 16 23:54:38 enterprise amavis[58567]: (58567-03) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: MIeaBhcawP2y, Hits: -2.099, size: 4642, queued_as: 9D4475F979, dkim_sd=202011:onlineentertainment.com, 779 ms
Dec 16 23:54:38 enterprise postfix/smtp[3129]: D03835F97D: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.81, delays=0.01/0.01/0/0.78, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 9D4475F979)
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: D03835F97D: removed
Dec 16 23:54:38 enterprise postfix/pickup[39522]: DE1525F980: uid=33 from=<[email protected]>
Dec 16 23:54:38 enterprise postfix/cleanup[2761]: DE1525F980: message-id=<[email protected]>
Dec 16 23:54:38 enterprise postfix/qmgr[41828]: DE1525F980: from=<[email protected]>, size=4109, nrcpt=1 (queue active)
Dec 16 23:54:39 enterprise postfix/smtpd[3133]: connect from localhost[127.0.0.1]
Dec 16 23:54:39 enterprise postfix/smtpd[3133]: 2A03F5F97D: client=localhost[127.0.0.1]
Dec 16 23:54:39 enterprise postfix/cleanup[2761]: 2A03F5F97D: message-id=<[email protected]>
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 2A03F5F97D: from=<[email protected]>, size=5174, nrcpt=1 (queue active)
Dec 16 23:54:39 enterprise amavis[34564]: (34564-16) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: QfInV79FpesV, Hits: -2.099, size: 4650, queued_as: 2A03F5F97D, dkim_sd=202011:onlineentertainment.com, 856 ms
Dec 16 23:54:39 enterprise postfix/smtp[2762]: 313375F97E: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.99, delays=0.01/0.11/0.01/0.86, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 2A03F5F97D)
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 313375F97E: removed
Dec 16 23:54:39 enterprise postfix/pickup[3151]: 5BE7C5F981: uid=33 from=<[email protected]>
Dec 16 23:54:39 enterprise postfix/cleanup[2761]: 5BE7C5F981: message-id=<[email protected]>
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 5BE7C5F981: from=<[email protected]>, size=4108, nrcpt=1 (queue active)
Dec 16 23:54:39 enterprise postfix/smtpd[2771]: connect from localhost[127.0.0.1]
Dec 16 23:54:39 enterprise postfix/smtpd[2771]: 8047B5F97E: client=localhost[127.0.0.1]
Dec 16 23:54:39 enterprise postfix/cleanup[2761]: 8047B5F97E: message-id=<[email protected]>
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 8047B5F97E: from=<[email protected]>, size=5129, nrcpt=1 (queue active)
Dec 16 23:54:39 enterprise amavis[58567]: (58567-04) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: abrUz0K5KSll, Hits: -2.099, size: 4621, queued_as: 8047B5F97E, dkim_sd=202011:onlineentertainment.com, 882 ms
Dec 16 23:54:39 enterprise postfix/smtp[3129]: 877355F97F: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=0.99, delays=0.01/0.1/0/0.88, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 8047B5F97E)
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 877355F97F: removed
Dec 16 23:54:39 enterprise postfix/pickup[3151]: CB0395F982: uid=33 from=<[email protected]>
Dec 16 23:54:39 enterprise postfix/cleanup[2761]: CB0395F982: message-id=<[email protected]>
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: CB0395F982: from=<[email protected]>, size=4124, nrcpt=1 (queue active)
Dec 16 23:54:39 enterprise postfix/smtp[3134]: 4B5CC5F977: to=<[email protected]>, relay=recipientdomain-com.mail.protection.outlook.com[123.12.9.36]:25, delay=1.6, delays=0.01/0.01/0.27/1.3, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=29476360558290, Hostname=AM6PR08MB4674.eurprd08.prod.outlook.com] 15208 bytes in 0.138, 107.008 KB/sec Queued mail for delivery)
Dec 16 23:54:39 enterprise postfix/qmgr[41828]: 4B5CC5F977: removed
Dec 16 23:54:40 enterprise postfix/smtpd[3133]: 090B75F977: client=localhost[127.0.0.1]
Dec 16 23:54:40 enterprise postfix/cleanup[2761]: 090B75F977: message-id=<[email protected]>
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 090B75F977: from=<[email protected]>, size=5126, nrcpt=1 (queue active)
Dec 16 23:54:40 enterprise amavis[34564]: (34564-16-2) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 9OD8VAmXIwx9, Hits: -2.099, size: 4618, queued_as: 090B75F977, dkim_sd=202011:onlineentertainment.com, 859 ms
Dec 16 23:54:40 enterprise postfix/smtp[2762]: DE1525F980: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=2, delay=1.1, delays=0.01/0.28/0/0.86, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 090B75F977)
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: DE1525F980: removed
Dec 16 23:54:40 enterprise postfix/pickup[3151]: 46D3D5F980: uid=33 from=<[email protected]>
Dec 16 23:54:40 enterprise postfix/cleanup[2761]: 46D3D5F980: message-id=<[email protected]>
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 46D3D5F980: from=<[email protected]>, size=4104, nrcpt=1 (queue active)
Dec 16 23:54:40 enterprise postfix/smtpd[2771]: 6D3E55F97F: client=localhost[127.0.0.1]
Dec 16 23:54:40 enterprise postfix/cleanup[2761]: 6D3E55F97F: message-id=<[email protected]>
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 6D3E55F97F: from=<[email protected]>, size=5121, nrcpt=1 (queue active)
Dec 16 23:54:40 enterprise amavis[58567]: (58567-04-2) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: HWq-d2xorNb9, Hits: -2.099, size: 4617, queued_as: 6D3E55F97F, dkim_sd=202011:onlineentertainment.com, 917 ms
Dec 16 23:54:40 enterprise postfix/smtp[3129]: 5BE7C5F981: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=2, delay=1.1, delays=0.02/0.16/0/0.92, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 6D3E55F97F)
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 5BE7C5F981: removed
Dec 16 23:54:40 enterprise postfix/smtp[3139]: 9D4475F979: to=<[email protected]>, relay=recipientdomain-com.mail.protection.outlook.com[123.12.10.36]:25, delay=2, delays=0.01/0.02/0.21/1.8, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=53919019439079, Hostname=DB6PR0801MB2088.eurprd08.prod.outlook.com] 14660 bytes in 0.243, 58.906 KB/sec Queued mail for delivery)
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 9D4475F979: removed
Dec 16 23:54:40 enterprise postfix/smtp[3134]: 090B75F977: to=<[email protected]>, relay=recipientdomain-com.mail.protection.outlook.com[123.12.8.36]:25, delay=0.65, delays=0.01/0/0.07/0.57, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=7189775259089, Hostname=VI1PR08MB3775.eurprd08.prod.outlook.com] 14799 bytes in 0.136, 105.753 KB/sec Queued mail for delivery)
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: 090B75F977: removed
Dec 16 23:54:40 enterprise postfix/pickup[3151]: B76765F979: uid=33 from=<[email protected]>
Dec 16 23:54:40 enterprise postfix/cleanup[2761]: B76765F979: message-id=<[email protected]>
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: B76765F979: from=<[email protected]>, size=4148, nrcpt=1 (queue active)
Dec 16 23:54:40 enterprise postfix/smtpd[3133]: EE50E5F977: client=localhost[127.0.0.1]
Dec 16 23:54:40 enterprise postfix/cleanup[2761]: EE50E5F977: message-id=<[email protected]>
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: EE50E5F977: from=<[email protected]>, size=5145, nrcpt=1 (queue active)
Dec 16 23:54:40 enterprise amavis[34564]: (34564-16-3) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 2t01vbNEsLgw, Hits: -2.099, size: 4633, queued_as: EE50E5F977, dkim_sd=202011:onlineentertainment.com, 937 ms
Dec 16 23:54:40 enterprise postfix/smtp[2762]: CB0395F982: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=3, delay=1.2, delays=0.01/0.22/0/0.94, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as EE50E5F977)
Dec 16 23:54:40 enterprise postfix/qmgr[41828]: CB0395F982: removed
Dec 16 23:54:41 enterprise postfix/smtp[3153]: 8047B5F97E: to=<[email protected]>, relay=recipientdomain-com.mail.protection.outlook.com[123.12.10.36]:25, delay=1.6, delays=0.01/0.02/0.17/1.3, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=39006892988455, Hostname=AM7PR08MB5334.eurprd08.prod.outlook.com] 14696 bytes in 0.072, 197.088 KB/sec Queued mail for delivery)
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: 8047B5F97E: removed
Dec 16 23:54:41 enterprise postfix/pickup[3151]: 3E6035F981: uid=33 from=<[email protected]>
Dec 16 23:54:41 enterprise postfix/cleanup[2761]: 3E6035F981: message-id=<[email protected]>
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: 3E6035F981: from=<[email protected]>, size=4116, nrcpt=1 (queue active)
Dec 16 23:54:41 enterprise postfix/smtpd[2771]: 4EAFD5F97E: client=localhost[127.0.0.1]
Dec 16 23:54:41 enterprise postfix/cleanup[2761]: 4EAFD5F97E: message-id=<[email protected]>
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: 4EAFD5F97E: from=<[email protected]>, size=5115, nrcpt=1 (queue active)
Dec 16 23:54:41 enterprise amavis[58567]: (58567-04-3) Passed CLEAN {RelayedOpenRelay}, [127.0.0.1] <[email protected]> -> <[email protected]>, Message-ID: <[email protected]>, mail_id: 18YuKNQ-nYvh, Hits: -2.099, size: 4613, queued_as: 4EAFD5F97E, dkim_sd=202011:onlineentertainment.com, 868 ms
Dec 16 23:54:41 enterprise postfix/smtp[3129]: 46D3D5F980: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, conn_use=3, delay=1.1, delays=0.01/0.17/0/0.87, dsn=2.0.0, status=sent (250 2.0.0 from MTA(smtp:[127.0.0.1]:10025): 250 2.0.0 Ok: queued as 4EAFD5F97E)
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: 46D3D5F980: removed
Dec 16 23:54:41 enterprise postfix/smtp[3145]: 2A03F5F97D: to=<[email protected]>, relay=recipientdomain-com.mail.protection.outlook.com[123.12.8.36]:25, delay=2.4, delays=0.01/0.02/0.1/2.3, dsn=2.6.0, status=sent (250 2.6.0 <[email protected]> [InternalId=28737626183423, Hostname=AM0PR08MB5073.eurprd08.prod.outlook.com] 14768 bytes in 0.153, 94.061 KB/sec Queued mail for delivery)
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: 2A03F5F97D: removed
Dec 16 23:54:41 enterprise postfix/pickup[3151]: B708C5F980: uid=33 from=<[email protected]>
Dec 16 23:54:41 enterprise postfix/cleanup[2761]: B708C5F980: message-id=<[email protected]>
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: B708C5F980: from=<[email protected]>, size=4131, nrcpt=1 (queue active)
Dec 16 23:54:41 enterprise postfix/smtpd[3133]: D806A5F97D: client=localhost[127.0.0.1]
Dec 16 23:54:41 enterprise postfix/cleanup[2761]: D806A5F97D: message-id=<[email protected]>
Dec 16 23:54:41 enterprise postfix/qmgr[41828]: D806A5F97D: from=<[email protected]>, size=5181, nrcpt=1 (queue active)