Fixed in 6.29

Did you report this to support@mikrotik.com?

Just did it.

Problem with e-mail client still exists.
If you use TLS then the second EHLO, which is normally issued after STARTTLS, is malformed and rejected by postfix with error "Helo command rejected: invalid ip address"

Status update after upgrading to 6.28 - no change, problem still exists. Here is a full RB log of an email session if your RB email client is configured to use TLS (/tool e-mail set start-tls=yes): Apr/22/2015 13:49:38 e-mail,debug EMAIL: recv: 220 mail.example.com NO UCE ESMTP Apr/22/2015 13:49:38 ...

What about SMTP HELO problem discussed in http://forum.mikrotik.com/viewtopic.php?f=2&t=93902 ?

Temporary solution would be to comment out reject_invalid_helo_hostname in smtpd_helo_restrictions in /etc/postfix/main.cf but you should be ready to deal with possibly increased amount of spam.


-tadas

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