Users can't send emails despite authenticating SMTP

microvax

• April 15, 2022 07:19

Hello, We recently moved to a newly installed dedicated server and noticed that some users can't send emails using Outlook unless I add their IPs to both the Trusted SMTP IP addresses and Bypass all SMTP sender verification checks in EXIM configuration. When I don't do so, they receive a 0x800CCC0F error message with a 550 code stating that their IP is listed in SPAMHAUS

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  kodeslogic

  • April 15, 2022 13:12

  Does a newly installed dedicated server have the same IP address that you had on the old server? If it is a new IP address on the new server then the users need to make sure their incoming/outgoing mail server in the mail settings (in outlook) is resolving to the new IP address.

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  cPRex Jurassic Moderator

  • April 15, 2022 14:58

  0x800CCC0F is a connectivity error, so checking the details like @kodeslogic mentioned would be a good first step.

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