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WHMCS Smtp error
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WHMCS Smtp error

Awmusic12635Awmusic12635 Member, Host Rep
edited August 2012 in Help


Lately I have been dealing with trying to make sure our emails for Fliphost are delivered and not sent to spam. I saw someone recommend the service , so I decided to give it a try. Most of the time it works great, but at random times Whmcs will give me the error when sending an email:

SMTP Error: Could not Authenticate

My login details are correct. Another error it sometimes throws is:

SMTP Error: Data not accepted

Most of the time, this service works great, but the times it does not happens enough that I want this resolved. Have any of you had this problem? Perhaps I'm missing something obvious.


  • I haven't seen this, been using

    Thanked by 1Asim
  • klikliklikli Member
    edited August 2012

    One possibility is that you had hit the rate limit or so...
    <derail>You might want to consider SendGrid or AWS SES</derail>

  • serverbearserverbear Member
    edited August 2012

    Not used myself, Mailgun has been awesome for us (shows clicks, open rates & also spam report rates etc).

  • I just use gmail for domain email and using whmcs's smtp for email. No problems so far.

  • klikliklikli Member
    edited August 2012

    Topic: WHMCS Smtp error
    Reply: I uses and gives me no error whatsoever.

  • This is due to the connection to SMTPs servers or Invalid emails I assume; I have zero issues but occasionally see this.

    Nothing to worry about though.

  • @Jacob what do you mean nothing to worry about? Is the email put in some sort of queue to retry after a failed SMTP auth?

  • AsimAsim Member

    @Damian said: I haven't seen this, been using

    Same here, mandrill is awesome

  • TazTaz Member
    edited August 2012

    Why don't you use good ol' DaddyG? Something such as basic mail delivery can be done for almost at no cost using Google.

  • AlexBarakovAlexBarakov Member, Patron Provider

    I like sendgrid, however the mandrill one will most likely be free for me, atleast this month.

  • Awmusic12635Awmusic12635 Member, Host Rep

    Think I will switch to mandrill , I like the interface and I get a better deal.

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