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Configuring SMTP to work with exchange 2013
osTicket Version v1.10.1 (9ae093d)
Web Server Software Apache/2.4.10 (Debian)
MySQL Version 5.5.58
We're using a few different mail accounts with our instance and we've got inbound mail working using imap and outbound mail using port 25 and no authentication. This is fine for the emails that are internal mails on mail domains managed by our server. Where it has to relay to other addresses we get the following error
Unable to email via SMTP:%servername%:25 [%accountname%] Failed to add recipient: %externalmail% [SMTP: Invalid response code received from server (code: 550, response: 5.7.1 Unable to relay)]
If I change one of the mail accounts SMTP settings to port 587 and authentication required, I'm getting
Unable to login. Check SMTP settings
authentication failure [SMTP: STARTTLS failed (code: 220, response:2.0.0. SMTP server ready)]
If I try telnet in to exchange on 587 from the osticket server I get
Connected to %servername%
Escape character is '^] '.
220 %servername% Microsoft ESMTP MAIL Service ready
AUTH GSSAPI NTLM
Anyone give me a clue how to get this working?