SMTP Connection Refused for any Account Except root

Dean_ONP

• April 25, 2018 23:10

I can run the following command and connect successfully under root account: telnet smtp.office365.com 587 When run under any other account this will not connect, receive: Trying 40.100.29.34... telnet: connect to address 40.100.29.34: Connection refused I have tried setting in WHM: Server Settings >> Tweak Settings: Prevent "nobody" from sending mail [?] = off Restrict outgoing SMTP to root, exim, and mailman (FKA SMTP Tweak) [?] = off And set: Security Centre >> SMTP Restrictions: Disabled. Same issue. What am I missing? Started looking in to this due to an account on the server wanting to use PHPMailer to send mail using O365 server and they get the connection refused error.

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  cPanelLauren

  • April 26, 2018 14:28

  Hi @Dean_ONP Do you have CSF with SMTP_BLOCK enabled by chance? Thank you,

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  Dean_ONP

  • April 26, 2018 21:27

  cPanelLauren, you genius, that's it! Thank you. The old SMTP_BLOCK-enabled-in-CSF trick.

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  Dean_ONP

  • April 27, 2018 01:04

  Follow up question; With remote SMTP connections no longer restricted, is there a way to whitelist/blacklist remote SMTP connections by IP or URI?

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  Dean_ONP

  • April 27, 2018 01:24

  I see you can allow specific accounts to bypass the SMTP_BLOCK with it enabled: --- Always allow the following comma separated users and groups to bypass SMTP_BLOCK Note: root (UID:0) is always allowed SMTP_ALLOWUSER = SMTP_ALLOWGROUP = ---

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  cPanelLauren

  • April 27, 2018 12:04

  Hi @Dean_ONP I'm so happy that resolved the issue! I'm glad you also found that you can allow specific accounts! Please let us know if you have any further issues with this. Thank you,

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