You need to authenticate with either SPF or DKIM. As you’re using a null sender, you can set up SPF on the EHLO value. Or you can sign outgoing mail with DKIM, dealer’s choice.
laura > On 27 Aug 2024, at 11:56, Eduardo Diaz Comellas via mailop > <mailop@mailop.org> wrote: > > Hi all, > > I've got a couple of complains from customers saying that the vacation > message is not being received by Gmail users. Our email service is quite > standard, with dovecot+sieve processing the email storage and autoresponders. > > I've confirmed that the problem is true: > > 2024-08-27 11:08:09 1sisBN-002eWx-KM <= <> H=(mydovecot.host) [172.30.6.182] > P=esmtp K S=1087 id=dovecot-sieve-1724749689-16845...@mydovecot.host > 2024-08-27 11:08:10 1sisBN-002eWx-KM ** randomgmailu...@gmail.com > R=hubbed_hosts T=remote_smtp H=gmail-smtp-in.l.google.com [173.194.76.27] > X=TLS1.3:ECDHE_X25519__ECDSA_SECP256R1_SHA256__AES_256_GCM:256 CV=yes > DN="CN=mx.google.com": SMTP error from remote mail server after pipelined end > of data: 550-5.7.26 Your email has been blocked because the sender is > unauthenticated.\n550-5.7.26 Gmail requires all senders to authenticate with > either SPF or DKIM.\n550-5.7.26\n550-5.7.26 Authentication > results:\n550-5.7.26 DKIM = did not pass\n550-5.7.26 SPF [] with ip: > [555.555.555.555] = did not pass\n550-5.7.26\n550-5.7.26 For instructions on > setting up authentication, go to\n550 5.7.26 > https://support.google.com/mail/answer/81126#authentication > ffacd0b8rr97d-373081420c7si4806836f8f.262 - gsmtp > 2024-08-27 11:08:10 1sisBN-002eWx-KM Frozen (delivery error message) > > > I think that sending the vacation messages with null sender is an standard > practise and the best way to avoid loops. I've found no problems with any > other email providers: only gmail is blocking this messages. > > Does anyone have this issue? How do you deal with it? > > Best regards. > > -- > Eduardo Díaz Comellas > Ultreia Comunicaciones, S.L. > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop -- The Delivery Expert Laura Atkins Word to the Wise la...@wordtothewise.com Delivery hints and commentary: http://wordtothewise.com/blog
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