# Failed to authenticate on SMTP server with username **URL:** \ **Category:** Product Support\ **Created:** [April 30, 2024, 9:40am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908 "2024-04-30T09:40:49Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![pixuai](https://avatars.discourse-cdn.com/v4/letter/p/e99b99/32.png) [@pixuai](https://forum.mautic.org/u/pixuai)\ **Post date:** [April 30, 2024, 9:40am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/1 "2024-04-30T09:40:49Z")
**Your software** My Mautic version is: 5 My PHP version is: 8.1 My Database type and version is: mariadb **Your problem** My problem is: Having used the right SMTP credentials and tested all ports, I am getting `Failed to authenticate on SMTP server with username "apikey" using the following authenticators: "LOGIN", "PLAIN". Authenticator "LOGIN" returned "Expected response code "235" but got code "535", with message "535 Authentication failed: The provided authorization grant is invalid, expired, or revoked".". Authenticator "PLAIN" returned "Expected response code "235" but got empty code.".` Manually testing the same credentials using swaks on the commandline works. `swaks --to *@*.net --from *@*.me --server smtp.sendgrid.net --auth LOGIN --auth-user apikey --auth-password '*'` Steps I have tried to fix the problem: I verified credentials and ports many times. They work. ---
**Author:** ![pixuai](https://avatars.discourse-cdn.com/v4/letter/p/e99b99/32.png) [@pixuai](https://forum.mautic.org/u/pixuai)\ **Post date:** [April 30, 2024, 9:46am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/2 "2024-04-30T09:46:28Z")
And of course I found the issue right after writing. There is a small lock icon set as a placehalder. Make sure you detele it before you paste your key. ---
**Author:** ![danieleaccuware](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/danieleaccuware/32/627_2.png) [@danieleaccuware](https://forum.mautic.org/u/danieleaccuware)\ **Post date:** [May 8, 2024, 10:04am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/3 "2024-05-08T10:04:56Z")
THANKS! Can you believe that I spent 8 days on this without finding the issue?! I thought that the lock icon was NOT part of the password field, so I was not even trying to remove it. ---
**Author:** ![morten](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/morten/32/6618_2.png) [@morten](https://forum.mautic.org/u/morten)\ **Post date:** [June 8, 2024, 10:18am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/4 "2024-06-08T10:18:50Z")
That should be a BUG !! Thanks for pointing it out!! 🙂 ---
**Author:** ![peter\_k](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/peter_k/32/511_2.png) [@peter\_k](https://forum.mautic.org/u/peter_k)\ **Post date:** [June 9, 2024, 7:39am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/5 "2024-06-09T07:39:38Z")
Yes. Please report it on GitHub so that someone can amend the UI. ---
**Author:** ![arnoldmatt](https://avatars.discourse-cdn.com/v4/letter/a/e9bcb4/32.png) [@arnoldmatt](https://forum.mautic.org/u/arnoldmatt)\ **Post date:** [June 10, 2024, 11:08am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/6 "2024-06-10T11:08:09Z")
I’m having the same issue with Sendgrid on Mautic 5! Manually testing works with swaks, but Mautic fails to authenticate. Did you find a solution? ---
**Author:** ![manuelvg](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/manuelvg/32/4537_2.png) [@manuelvg](https://forum.mautic.org/u/manuelvg)\ **Post date:** [July 5, 2024, 8:44pm UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/7 "2024-07-05T20:44:04Z")
I did have the same problem and delete the icon in the password field and works perfect. Thank you very much for this comment. ---
**Author:** ![silviolima](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silviolima/32/2021_2.png) [@silviolima](https://forum.mautic.org/u/silviolima)\ **Post date:** [July 7, 2024, 12:40am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/8 "2024-07-07T00:40:33Z")
Apaguei o ícone de cadeado no campo da senha e… funcionou!!! ---
**Author:** ![weasam](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/weasam/32/679_2.png) [@weasam](https://forum.mautic.org/u/weasam)\ **Post date:** [October 9, 2024, 1:26pm UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/9 "2024-10-09T13:26:48Z")
You are my day savior, you save my days, Thanks a lot 💓 ---
**Author:** ![opggmarketing](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/opggmarketing/32/13552_2.png) [@opggmarketing](https://forum.mautic.org/u/opggmarketing)\ **Post date:** [January 21, 2025, 8:41pm UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server-with-username/31908/10 "2025-01-21T20:41:29Z")
WOW I can’t believe that was my issue… Issue is still present in 5.2.1!