SMTP Mailer suddenly started failing?!?!

Please help

My SMTP mailer has been working without a hitch for a while since i sorted the website, and the past couple of days it has been failing to send emails out and im recieving bounce back notifications for email addresses on my own server ?

i went onto the Mailer to check the settings and every test message i try to send is failing.....

Please help!?

You may have to contact your host. What ever SMTP server you have the mailer configured to send mail to is either down or not accepting mail.

Thanks Deano,

i have submitted a ticket to cpanel as this is not the first time i have had issues with the mail server

and mi checking all the settings now to make sure no filters are on or restrictions.

its highly irritating.

post the error messages.

SMTP Error: The following recipients failed: chris.kendall@voiceartistsunited.com

its the same for all emails sent from the SMTP yet if i uncheck the use smtp it works, yet the details have not changed at all, and it was working fine !

I had a look in the smtp log and found this 

The SMTP module can be used to send mail through a different mail server than the one on the server.  If you turn off SMTP, then it will send the emails out through the default mail server on the server; which seems to be the case with you.  Check the settings in the SMTP module.  You can try pinging the mail server that you have listed in the SMTP.

It sounds as if they may have changed the mail server settings to handle relaying mail.  Notice it said that verification failed for no-reply@voiceartistsunited.com; they are only going to allow a real person to send mail through the server.  It checks to see if no-reply existed, it did not so they rejected the mail.  Try creating an account, no-reply@voiceartistsunited.com and see if that solves the issue. 

If people do reply to the no-reply, set up an auto-repsonder that returns with; "This email was sent to a box that is not monitored and no one will see it" or some such thing.  You can then just dump the emails in the mail box from time to time.

Thanks GeekGirl - I discovered that after looking through that log properly and yes that IS the fix for the issue!

Not for me. I changed to my regular email address and it still fails.

 that's strange something with me, I Im not getting any email notifications such as new member joining. this started to happen like 2 days ago out of the blue...

I am having the same issue. What is weird is I don't think it's my smtp mod. I think it has something to do with changes to how spam email is being handled and the term 'noreply@' or no-reply@' or admin@. I am investigating further.

any update on this?, i have done no changes but somehow all email notifications stopped.

A follow-up just in case someone is dealing with the same issue...

I'm my host did a test because everything was fine on their end. it turns out that when e-mails were forwarded to my hotmail it was being blocked by Hotmail its self. I guess hotmail was blocking the hosting company I use. They sent hotmail an email or something because withing 2-3 hours i was able to get email notifications again.