Posts tagged with “smtp”

Mon 4 Jan
09:51 AM

Desactivar el Fixup Smtp de Cisco

Si tienes un firewall Cisco entre tu red y el resto del mundo, tendrás problemas con los correos salientes. Por ejemplo, hacer algo tan simple como un relay de tu smtp interno a uno externo no funcionará. Si tienes postfix, este será el mensaje que verás en el log:

postfix/smtp: enabling PIX workarounds: disable_esmtp delay_dotcrlf for ironmail.irontec.com:25

La solución es ejecutar lo siguiente en el Cisco:

en
conf t
no fixup smtp
^Z
wr mem

El origen de este problema es el uso de un Firewall Cisco bugeado:

smtp_pix_workarounds (default: disable_esmtp, delay_dotcrlf)

A list that specifies zero or more workarounds for CISCO PIX firewall bugs. These workarounds are implemented by the Postfix SMTP client. Workaround names are separated by comma or space, and are case insensitive. This parameter setting can be overruled with per-destination smtp_pix_workaround_maps settings.

delay_dotcrlf

Insert a delay before sending "." after the end of the message content. The delay is subject to the smtp_pix_workaround_delay_time and smtp_pix_workaround_threshold_time parameter settings.

disable_esmtp

Disable all extended SMTP commands: send HELO instead of EHLO. This feature is available in Postfix 2.4 and later. The default settings are backwards compatible with earlier Postfix versions.

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