Constant “Authentication Failed” Errors

  • Resolved boardboss

    (@boardboss)


    1 week, 5 days ago

    I use Post SMTP on many sites, and I also install the pro version once the free plugin is operational. I am using version 3.9.4 of Post SMTP. Unfortunately, I have not been able to successfully send an email from one site.

    During the setup process, I used the same exact server settings I always use on other sites. I use a password manager, and I copied the username (email address) from there, as well as the password, to help avoid typos. Nothing succeeded.

    I am able to log into the webmail for this email account using the same exact credentials. I also deleted the email account in question from my email client, and recreated the email account using the same copied-and-pasted credentials. No problems.

    Can you think of anything I might have missed? I am going to raise a ticket with my email provider to see if perhaps the server’s IP address might be blocked for some reason, but I cannot think of anything else that could cause this.

Viewing 2 replies - 1 through 2 (of 2 total)
  • Plugin Support M Aqib Khan

    (@aqibkhan9)

    1 week, 5 days ago

    Hi @boardboss,

    Thank you for reaching out.

    If you’re seeking support for the Pro version of Post SMTP, I recommend opening a ticket through our official website so our team can assist you directly with the licensed features.

    Regarding the authentication issue, if you’re using the Other SMTP socket to send email, I’d suggest testing your configuration with our SMTP Test Tool. It can help identify whether the problem is with your credentials, server settings, or connectivity before troubleshooting further.

    Looking forward to getting this resolved for you.

    Thread Starter boardboss

    (@boardboss)

    1 week, 5 days ago

    Thank you for the reply. I am only seeking support for the free plugin. I never install the pro version until the free version works.

    I used the SMTP Test Tool and received the result I expected: the test failed.

    Since I had tested everything else I could think of, I decided to test the one other thing I knew I could control: I changed the password for the email account. The test email sent successfully.

    I use a password manager, so I regularly use long, random passwords, as I do not have to memorize any of them. I am guessing that there must have been some pattern of characters that either WordPress or your plugin did not like.

    Since I am no longer using the old password, I will open a support ticket and paste the old password in it so it can be determined what the root cause of the issue was. The username/password combination I had worked everywhere but failed using the SMTP Post plugin on an up-to-date WordPress site.

Viewing 2 replies - 1 through 2 (of 2 total)

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