There is something wrong with smtp server or whmcs, sometimes it works sometimes it doesn't.

It's wired lol, everything seems to run fine if I look over whm STATUS. But in whmcs I got this message sometimes:

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

Any ideas what might be wrong ?

When you log into WHMCS and go to the Admin panel, then click on Configuration, General Settings and then Mail, what do you have entered in for SMTP Host and Mail Type?

I use smtp server, all info is correct there .. I tried it multiple times.

As I said sometimes it works sometimes it dont ;)

Do you have to use the SMTP server, or is there a reason you prefer it over the mail() function?

Do you have to use the SMTP server, or is there a reason you prefer it over the mail() function?

SMTP is always preferred if you want a wide range of users to actually get your emails.

Are you accessing the right port? Using the right login details? And MACscr is right - it is preferred if you wish to reach clients all the time, sometimes the mail() function can be a bit buggy I hear...

SMTP is always preferred if you want a wide range of users to actually get your emails.

I beg to differ or at least request some proof! A properly configured server and mail daemon should be sufficient for most, if not all users when the mail() function is executed.

The notion that using mail() is a bad idea, does not make any technical sense to me and I know it's definitely not the case for Yahoo, Hotmail or Gmail (the big 3!) all of whom deliver messages sent from mail() directly to the inbox - not the spam folder.

I'm not saying some mail servers wouldn't reject or flag a message because it was sent using mail() but that's really over the top and a bit anal, IMO. :)

i had the same problem and i check the server there is a ConfigServer Security&Firewall and disabled and checked it is sending properly.I am going to remove port 25 from the configuration.You may try also.

Regards