Is it possible to use another port for SMTP connection if 25 port is blocked by ISP?

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    Sait Firat NEMIS

    It's is very bad situation. There is no solution ?

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    Ivan Postnikov

    Hello Sait Firat NEMIS

    The limitation is on infrastructure level and Plesk has no direct influence on it.

    So, the solutions are to ask ISP to unblock port if possible or to setup relay.

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    Dennis Bronno Brouwer

    So I would need to Ask Google to open their Cloud Services on Port 25?

    For sure I already know the answer, I added a rule to the Firewall for port 2525 and I would like to use the SMTP server on that Port is that possible?

     

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    philippe henneau

    this means no PLESK on Google GCP, a real constraint

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    Ivan Postnikov

    Hello,

    Dennis Bronno Brouwer philippe henneau

    Google Cloud doesn't open port 25 for anyone.

    However, there's a workaround, see the details here.

     

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    philippe henneau

    indeed, GCP will not open Port 25, and yes the workaround , it works, we went for SendGrid but there is huge constraint for webhosters: each domain must be validated by endgrid, that means 3 records per domain. Each new domain must be manually validated over the SendGrid platform. We havent figured out yet out to have our Server IP validated for all the domains.More over they are costs associated with the workaround.

     

    Regards

     

    Philippe

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    Alex K

    Hello,

    i got the same problem, google cloud blocked all outgoing traffic to my plesk mail relay server.
    But thats not a big problem, plesk is listening on port 465 as well, so use this port instead of 25.

    Here is my postfix config on LAMP-Stack on GCP:
    relayhost = your-pleskserver.domain.com:465
    smtp_sasl_auth_enable = yes
    smtp_sasl_password_maps = hash:/etc/postfix/smtp_auth
    smtp_tls_security_level = encrypt
    smtp_tls_wrappermode = yes

    smtp_auth config on GPC:
    your-pleskserver.domain.com anymail@domain.com:PASSWORD

    After creating the smtp_auth file with your host + user:password you have to create the map file

    postmap /etc/postfix/smtp_auth

    Thats all, now you can reach your Plesk Mailserver over port 465 and use it as a relay.

    Greetz

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