Article ID: 111759, created on Aug 2, 2011, last review on Aug 12, 2014

  • Applies to:
  • Plesk 8.6 for Linux/Unix


When sending an e-mail to a recipient who has the special character '%' in their username, the following error is returned:

The recipient of the email:
'3358362402%domain.tld' 18/05/2011 17.40

Server Error: "553 we don't relay (#5.7.1)"


Replace the qmail-smtpd with the file from the attachment, in accordance with your OS architecture:

 qmail-smtpd for  CentOS 5 x32
 qmail-smtpd for  CentOS 5 x64

NOTE: Remember to backup the original binary and set all the appropriate permissions:

# ls -la /var/qmail/bin/qmail-smtpd
-r-xr-xr-x 1 root qmail 60248 May 25 15:23 /var/qmail/bin/qmail-smtpd


9fa0130c84cac4b292697ade62270a40 a914db3fdc7a53ddcfd1b2db8f5a1b9c 29d1e90fd304f01e6420fbe60f66f838 b8ef5052d936e902043e41759118114e 56797cefb1efc9130f7c48a7d1db0f0c

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