topic Re: Fixup Protocol SMTP 25 in Network Security https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779484#M977695 <HTML><HEAD></HEAD><BODY><P>== Issue is we cannot send emails to a few internet domain i.e. 2strategic.com</P><P></P><P>== Messages for these domains are stuck in the queue in a retry state.</P><P></P><P></P></BODY></HTML> Wed, 27 Jun 2007 14:23:26 GMT fullerthaler 2007-06-27T14:23:26Z Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779480#M977691 <P>Is Fixup protocol smtp 25 for inbound only? I've heard this can cause issues of all kinds. Should I disable it?</P> Mon, 11 Mar 2019 10:35:04 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779480#M977691 fullerthaler 2019-03-11T10:35:04Z Re: Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779481#M977692 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>Please refer to following link-</P><P></P><P><A class="jive-link-custom" href="http://www.cisco.com/en/US/docs/security/pix/pix63/command/reference/df.html#wp1067379" target="_blank">http://www.cisco.com/en/US/docs/security/pix/pix63/command/reference/df.html#wp1067379</A></P><P></P><P>This is for inbound smtp connections when outside clients are connecting to internal mail servers. Going by the link, if your mail server requires use of commands other than mentioned in the link (HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT), you may disable the fixup. This is generally true incase of Microsoft Exchange servers which uses Extended commands.</P><P></P><P>If you face issues with mails, you may test things with disabling the same-</P><P></P><P>no fixup protocol smtp 25</P><P></P><P>Hope this helps.</P><P></P><P>Regards,</P><P>Vibhor.</P></BODY></HTML> Mon, 25 Jun 2007 20:49:57 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779481#M977692 vitripat 2007-06-25T20:49:57Z Re: Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779482#M977693 <HTML><HEAD></HEAD><BODY><P>If I am having trouble sending messages out, will disabling the fixup protocol smtp 25 have any affect?</P></BODY></HTML> Tue, 26 Jun 2007 15:11:30 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779482#M977693 fullerthaler 2007-06-26T15:11:30Z Re: Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779483#M977694 <HTML><HEAD></HEAD><BODY><P>No.</P><P></P><P>Can u describe the issues sending mail out.</P><P></P><P>Is this domain specific or does it affect all outbound mail?</P><P></P><P></P></BODY></HTML> Wed, 27 Jun 2007 06:51:55 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779483#M977694 timkaye 2007-06-27T06:51:55Z Re: Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779484#M977695 <HTML><HEAD></HEAD><BODY><P>== Issue is we cannot send emails to a few internet domain i.e. 2strategic.com</P><P></P><P>== Messages for these domains are stuck in the queue in a retry state.</P><P></P><P></P></BODY></HTML> Wed, 27 Jun 2007 14:23:26 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779484#M977695 fullerthaler 2007-06-27T14:23:26Z Re: Fixup Protocol SMTP 25 https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779485#M977696 <HTML><HEAD></HEAD><BODY><P>It is not aware of inbound vs. outbound. Mailguard -- aka. fixup protocol smtp 25 breaks a number of various features with regards to ESMTP. Essentially the required commands are not forwarded to the server, commands such as X-LINK2STATE, Auth, Auth login, KILL, and WIZ are all discarded. </P><P></P><P>It should be noted that when fixup smtp is enabled, the *ONLY* valid commands are -- </P><P>HELO, MAIL, RCPT, DATA, RSET, NOOP, and QUIT, and even at that case, some clients/servers are still broken. </P><P></P></BODY></HTML> Wed, 27 Jun 2007 18:05:46 GMT https://community.cisco.com/t5/network-security/fixup-protocol-smtp-25/m-p/779485#M977696 straticus1 2007-06-27T18:05:46Z