Email Sending Failed - SMTP Error: Could not connect to SMTP host.

[silkenstrand]

WHMCS has been running for a couple of years. All of sudden I see that I am receiving an error, Email Sending Failed - SMTP Error: Could not connect to SMTP host., when the system attempts to send invoices. I've looked up similar threads on the forum and have tried 'everything'.

 

Change mail.mydomain.com to localhost

verified that the Setup>General Settings>Email Address and Setup>General Settings>Mail>SMTP Username and password are correct.

 

Any new ideas?

[gfoulks]

having the same issue here

[Revolution]

Having same problem here as well.

[laszlof]

Have you tried telneting to port 25 on the smtp host from the whmcs server?

[plusplushosting]

i had the same problem and as i have whmcs in a vps the problem was the memory/cpu usage....i moved to a cloud VPS with more resources and the error has been corrected....check if is not a similar problem in your case.

[Doulos]

Can't get SMTP to work at all with WHMCS. I tried several different accounts and providers.

[Doulos]

I was able to get SMTP working, but not with any of my accounts related to my hosting co. I had to use a gmail account to get it to work.

[laszlof]

Have you tried telneting to port 25 on the smtp host from the whmcs server?

 

Once again, have you tried this?

[mpkossen]

This puzzles me as well. I'm currently investigating. I hope to find out what happens soon.

[mpkossen]

(Sorry, cannot edit/update my previous post)

 

I've been unable to find the cause of the issue as it's hard to debug with the code that performs the call being encoded. This could probably be filed as a bug report since it's something that should work that doesn't for various people (who use 100% confirmed working details).