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Emails to Yahoo are rejected

[Luc, Gia]
Gia Luc
Newbie
Newbie
Posts: 6
Gia Luc - 09:42am, Aug 18 2020

Hello,

I have just installed mdaemon v20 on a Windows Server 2019 box. Outbound emails seem to go fine except for anything to @yahoo.com or @yahoo.co.uk, which are all rejected:

Tue 2020-08-18 15:19:47.665: 02: <-- 421 4.7.0 [TSS04] Messages from ??.??.??.?? temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

The external firewall blocks inbound port 25 from all external IP addresses so there is no way anybody is using mdaemon to send spam and causing user complaints, and the server isn't sending particularly many messages (up to 2000 a day). Some of the affected emails have been in the Retry queue for nearly 24 hours. I don't understand what is wrong or what to do to fix. Can somebody advise?

Tue 2020-08-18 15:19:47.386: 01: * Message-ID: <1590320208218141529907@acted.co.uk>
Tue 2020-08-18 15:19:47.386: 01: * Size: 2860; <c:\mdaemon\queues\remote\pd3501000002030.del1597760314.msg>
Tue 2020-08-18 15:19:47.494: 05: Resolving MX record for yahoo.co.uk (DNS Server: 168.63.129.16)...
Tue 2020-08-18 15:19:47.505: 05: * P=010 S=000 D=yahoo.co.uk TTL=(14) MX=[mx-eu.mail.am0.yahoodns.net]
Tue 2020-08-18 15:19:47.505: 05: Attempting SMTP connection to mx-eu.mail.am0.yahoodns.net
Tue 2020-08-18 15:19:47.505: 05: Resolving A record for mx-eu.mail.am0.yahoodns.net (DNS Server: 168.63.129.16)...
Tue 2020-08-18 15:19:47.507: 05: * D=mx-eu.mail.am0.yahoodns.net TTL=(1) A=[188.125.72.74]
Tue 2020-08-18 15:19:47.507: 05: * D=mx-eu.mail.am0.yahoodns.net TTL=(1) A=[188.125.72.73]
Tue 2020-08-18 15:19:47.507: 05: Randomly picked 188.125.72.74 from list of possible hosts
Tue 2020-08-18 15:19:47.507: 05: Attempting SMTP connection to 188.125.72.74:25
Tue 2020-08-18 15:19:47.507: 05: Waiting for socket connection...
Tue 2020-08-18 15:19:47.523: 05: * Connection established 10.20.3.4:62755 --> 188.125.72.74:25
Tue 2020-08-18 15:19:47.523: 05: Waiting for protocol to start...
Tue 2020-08-18 15:19:47.556: 02: <-- 220 mtaproxy201.free.mail.ir2.yahoo.com ESMTP ready Tue 2020-08-18 15:19:47.559: 03: --> EHLO acted.co.uk
Tue 2020-08-18 15:19:47.574: 02: <-- 250-mtaproxy201.free.mail.ir2.yahoo.com Tue 2020-08-18 15:19:47.574: 02: <-- 250-PIPELINING Tue 2020-08-18 15:19:47.574: 02: <-- 250-SIZE 41943040 Tue 2020-08-18 15:19:47.574: 02: <-- 250-8BITMIME Tue 2020-08-18 15:19:47.574: 02: <-- 250 STARTTLS Tue 2020-08-18 15:19:47.574: 03: --> STARTTLS
Tue 2020-08-18 15:19:47.589: 02: <-- 220 Ready for TLS Tue 2020-08-18 15:19:47.622: 01: SSL negotiation successful (TLS 1.2, 255 bit key exchange, 128 bit AES encryption) Tue 2020-08-18 15:19:47.624: 01: SSL certificate is not valid (not signed by recognized CA) Tue 2020-08-18 15:19:47.624: 03: --> EHLO ?????
Tue 2020-08-18 15:19:47.646: 02: <-- 250-mtaproxy201.free.mail.ir2.yahoo.com Tue 2020-08-18 15:19:47.646: 02: <-- 250-PIPELINING Tue 2020-08-18 15:19:47.646: 02: <-- 250-SIZE 41943040 Tue 2020-08-18 15:19:47.646: 02: <-- 250-8BITMIME Tue 2020-08-18 15:19:47.646: 02: <-- 250 OK Tue 2020-08-18 15:19:47.646: 03: --> MAIL From:<acted@acted.co.uk> SIZE=2860
Tue 2020-08-18 15:19:47.665: 02: <-- 421 4.7.0 [TSS04] Messages from ??.??.??.?? temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html Tue 2020-08-18 15:19:47.665: 03: --> QUIT
Tue 2020-08-18 15:19:47.666: 01: * This message is 4 minutes old; it has 56 minutes left in this queue
Tue 2020-08-18 15:19:47.667: 04: SMTP session terminated (Bytes in/out: 3940/456)

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Gia Luc - Aug 18, 2020 1:36 pm (#4 Total: 4)  

 

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Gia Luc
Newbie
Newbie
Posts: 6
Hello Arron,

Thank you so much for your prompt replies and the great suggestion. I'll give the MX Cache file a try!



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