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Email SMTP Service.

Discussion in 'Domains, DNS, Email & SSL Certificates' started by DaB, Aug 31, 2026.

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  1. Aug 31, 2026 #1
    DaB

    DaB Member

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    I am trying to configure and SMTP service to be used with Invision forum on a Digital Ocean droplet.

    I have setup the SMTP service with Resend, cut and paste the credentials into the Invision settings but it will not connect.

    I have checked the CFS Firewall and ports 465 and 567 are open.

    I get this message in the forum settings.

    Code:
     test email could not be sent. Check the settings entered are correct or contact your hosting or SMTP provider for more information.

Connection refused
    What am I doing wrong?
     
  2. Aug 31, 2026 #2
    eva2000

    eva2000 Administrator Staff Member

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    Probably need non standard ports as Digital Ocean now blocks them by default Why is SMTP blocked? | DigitalOcean Documentation

    Send emails with SMTP - Resend

     
  3. Aug 31, 2026 #3
    DaB

    DaB Member

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    I have tried the other ports and it still doesn't work. Is this a limitation with running a droplet on DigitalOcean, I can change host if need be.
     
  4. Sep 2, 2026 #4
    eva2000

    eva2000 Administrator Staff Member

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    Did you add the other ports 2465, or 2587 to CSF Firewall outbound ports whitelist in /etc/csf/csf.conf TCP_OUT and TCP6_OUT comma separated list and restart CSF with
    Code (Text):
    csf -ra

    See CSF Firewall - Centmin Mod LEMP Stack
     
  5. Sep 4, 2026 at 6:36 AM #5
    DaB

    DaB Member

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    All working now, I got the port number wrong.
     
  6. Sep 6, 2026 at 6:27 AM #6
    eva2000

    eva2000 Administrator Staff Member

    59,718
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    Ah that help! :)
     
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