MY SIP BLOCK SMTP Relay access denied

I have my own epost server hosted on linux Debian

with postfix and Dovcot

My epost clients is Microsoft outlook 2015

I work a lot with customers or elsewhere.

I experience up that email my not work because SIP / network admin has sprret port 25 (SNMP) to that I must use their SMTP server to send mail.

I've tried to open my server with 2 ports. 25 and 9800 it did not solve the problem.

I'm tired of having to change smtp server and ports to like that all tidne

Anybody know a fix ??

or must I go over to webmail or Exhange server?

for these error messages

'H****************' den 08.07.2016 21.26

Serverfeil: 554 5.7.1 <he****AT**,no>: Relay access denied

'E***************' den 13.07.2016 08.48

Serverfeil: 553 5.3.0 <er**AT*********',no>... We do not relay from [login to view URL]

Manejo de email Linux Microsoft Outlook Administración de redes Seguridad web

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