Zabbix 3.2 email notifications [4] timeout system call

[kc5kse]

I am unable to get emails from zabbix 3.2. I have verified my settings on the zabbix server box by telneting to port 25 of the mail server and sending a message. I have also verified with the 'nc -zv <mail fqdn> 25'.

Where/what else can I check?

[ovas]

Hello kc5kse!

You can check Reports -> Action log to check what error you receive for the email sending action. At least it may give you hints what to troubleshoot.
zabbix_server.log may also shed some light on the issue.

[kc5kse]

From Reports -> Action Log:

cannot connect to SMTP server "mail.omegabyte.com": cannot connect to [[mail.omegabyte.com]:25]: [4] Interrupted system call

Which mirrors what is in zabbix_server.log file.

[ovas]

When you tried to verify connection by telnet, did you try it from zabbix user?
If you had tried all the setting combination and it is fully operational from terminal, I can only offer to switch to DebugLevel=4 and try to find more verbose data from zabbix_server.log.

Are you able to set up alternative email gateway to test if it works?

[kc5kse]

When you tried to verify connection by telnet, did you try it from zabbix user?
If you had tried all the setting combination and it is fully operational from terminal, I can only offer to switch to DebugLevel=4 and try to find more verbose data from zabbix_server.log.

Are you able to set up alternative email gateway to test if it works?

Yes, that was the first thing I did. I am able to telnet to the mail server on port 25 and get a successful HELO return. I then sent myself a message successfully.

One thing I just did was go to https://mxtoolbox.com/diagnostic.aspx and it said there was no return PTR for the mail server. I'm wondering if that could cause this issue.

Debug has been on level 4 I'm seriously thinking of switching out company over to a new email service, ie RackSpace, etc...

[ovas]

PTR (reverse DNS) is more like email authentication method; from the MXToolbox perspective is used in spam-ranking of email server. Maybe this can have it's negative effect, can't be sure.

As a side note, you can try to use external scripts for email sending, for example as described here: https://www.zabbix.com/forum/showthread.php?t=22216

[kc5kse]

Well, after some intensive google searches, I came across ssmtp and the zabbix-sendmail script. Works flawlessly. I also got webhooks into Slack. So I just disable the email and go on with life