PowerMTA™ 4.5r1 
mta.streamad.in 

Top 10 queues in virtual MTA "pmta51-55" by number of recipients

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Name #Rcpt KBytes #Conn Paused Mode Last Error
gmail.com/pmta51-55 589 12,722.0 0 no normal 2026-04-04 17:30:35 message rate limit reached (based on queue's max-msg-rate in configuration) (10x)
yahoo.co.in/pmta51-55 85 2,251.9 0 no normal 2026-04-04 18:03:24 Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 51.68.102.55 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from venus.streamad.in (51.68.102.55) to mx-apac.mail.gm0.yahoodns.net (106.10.248.74)
yahoo.com/pmta51-55 78 2,066.0 0 no normal 2026-04-04 18:03:36 Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 51.68.102.55 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from venus.streamad.in (51.68.102.55) to mta6.am0.yahoodns.net (67.195.228.106)
hotmail.com/pmta51-55 71 1,880.8 0 no backoff 2026-04-04 18:05:26 message rate limit reached (based on queue's backoff-max-msg-rate in configuration)
yahoo.in/pmta51-55 23 609.2 0 no normal 2026-04-04 18:03:07 Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 51.68.102.55 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from venus.streamad.in (51.68.102.55) to mx-apac.mail.gm0.yahoodns.net (106.10.248.74)
bcasonline.org/pmta51-55 6 158.9 0 no backoff   
outlook.com/pmta51-55 6 159.0 0 no backoff 2026-04-04 18:04:50 Error: "550 5.7.1 Unfortunately, messages from [51.68.102.55] weren't sent. Please contact your Internet service provider since part of their network is on our block list (S3150). You can also refer your provider to http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol Filter Agent][AGT=PFA][MxId=11BD1E86C44E2D26] [CH3PEPF00000009.namprd04.prod.outlook.com 2026-04-04T12:34:50.749Z 08DE8F4365FDA3A5]" while connected from venus.streamad.in (51.68.102.55) to outlook-com.olc.protection.outlook.com (52.101.194.5)
live.com/pmta51-55 4 105.9 0 no backoff 2026-04-04 18:05:43 message rate limit reached (based on queue's backoff-max-msg-rate in configuration)
ymail.com/pmta51-55 3 79.4 0 no normal 2026-04-04 18:03:55 Error: "550 5.7.9 This mail has been blocked because the sender is unauthenticated. Yahoo requires all senders to authenticate with either SPF or DKIM. Authentication results: DKIM = FAILURE - SPF bcsonline.org.in with ip 51.68.102.55 = FAILURE. See https://senders.yahooinc.com/smtp-error-codes/#authentication-failures for more information." while connected from venus.streamad.in (51.68.102.55) to mta7.am0.yahoodns.net (67.195.228.109)
endurance.co.in/pmta51-55 2 53.0 0 no backoff   

10 of 22 matching queues.

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