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Cannot send emails to recipients with a number in the address

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  • Cannot send emails to recipients with a number in the address

    Hi there,

    I've found with latest verion of Espo I cannot send emails to recipients with the number in the e-mail address e.g: john3@whatever.com or john3doe@whatever.com

    Sending email returns red error on the top of the screen:

    Email sending failed: Unknown error.​

    and emails goes to the Draft folder.

    I've tested it on several envinronments Espo with different e-mails:

    Error is on Espo 8.1.3, 8.1.5. With Espo 8.0.3 everything is all right.


    Does enyone have the same error?

    Regards, Jacek​

  • #2
    Hi jacao,

    Unfortunately, I can't reproduce your issue.

    Please send error logs of your instance for detailed analysis (located in {ESPO_ROOT}/data/logs/ directory).

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    • #3
      Thank you for the reply.

      With the logs I've found:

      Code:
      [2024-03-05 10:40:36] ERROR: Email sending error: 5.1.1 <john3doe@whatever.com>: Recipient address rejected: User unknown in virtual mailbox table
      [2024-03-05 10:40:36] ERROR: Email sending:unknownError; 0
      Then I've realized that my SMTP test account is on the same server than e-mail recipient mailbox. The e-mail address with the numer I used was fake. I've expected Undelivered Mail Returned to Sender but server blocked sending this e-mail. So it's not a bug but feature

      Regards! Jacek


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