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Azure outbound communication SMTP

cn flag

I'm trying to configure SMTP on an Azure Windows server. There is a public IP address and a Network Security group. On my local machine I can test an SMTP server and it works, for example

telnet> open secure.emailsrvr.com 25
Trying 184.106.54.10...
Connected to secure.emailsrvr.com.
Escape character is '^]'.
220 smtp6.relay.ord1d.emailsrvr.com ESMTP - VA Code Section 18.2-152.3:1 forbids use of this system for unsolicited bulk electronic mail (Spam)

But on the Azure server, the same command gets this:

Microsoft Telnet> open secure.emailsrvr.com 25
Connecting To secure.emailsrvr.com...Could not open connection to the host, on port 25: Connect failed

I've tried to open an outbound port 25 in the Azure Network security group. I've disabled the firewall on the server. Name resolution is working with nslookup. I'm at a loss as to what is blocking the outbound communication.

joeqwerty avatar
cv flag
https://docs.microsoft.com/en-us/azure/virtual-network/troubleshoot-outbound-smtp-connectivity
Alex T. avatar
cn flag
Thank you. I didn't find this when searching. I'll give this a shot.
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