# Mandrill SMTP Error

**URL:** <https://forum.mautic.org/t/mandrill-smtp-error/1860>\
**Category:** Product Support\
**Created:** [May 20, 2015, 10:22am UTC](https://forum.mautic.org/t/mandrill-smtp-error/1860 "2015-05-20T10:22:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![fbugalla](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/fbugalla/32/759_2.png) [@fbugalla](https://forum.mautic.org/u/fbugalla)\
**Post date:** [May 20, 2015, 10:22am UTC](https://forum.mautic.org/t/mandrill-smtp-error/1860/1 "2015-05-20T10:22:25Z")

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Hello,  
  
I have been able to log with Mandrill at once with Mautic 1.0.4. Since I upgraded to 1.0.5 I am not able to log in anymore always getting this error when testing connection:  
  
  
  
“Failed to authenticate on SMTP server with username "email@mydomain.com” using 1 possible authenticators  
  
++ Starting MauticCoreBundleSwiftmailerTransportMandrillTransport \<\< 220 [smtp.mandrillapp.com](http://smtp.mandrillapp.com) ESMTP \>\> EHLO [www.mydomain.com](http://www.mydomain.com)\<\< 250-ip-10-107-137-250 250-PIPELINING 250-SIZE 26214400 250-STARTTLS 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250 8BITMIME \>\> STARTTLS \<\< 220 2.0.0 Ready to start TLS \>\> EHLO [www.mydomain.com](http://www.mydomain.com) \<\< 250-ip-10-107-137-250 250-PIPELINING 250-SIZE 26214400 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250 8BITMIME \>\> AUTH LOGIN \<\< 334 VXNlcm5hbWU6 \>\> YWRtaW5AZXNjb2xlc251cmlhLmNhdA== \<\< 334 UGFzc3dvcmQ6 \>\> N2ZBWXlIYlA4Z01hQ3hfUQ== \<\< 435 4.7.8 Error: authentication failed: UGFzc3dvcmQ6 !! Expected response code 235 but got code “435”, with message “435 4.7.8 Error: authentication failed: UGFzc3dvcmQ6 " \>\> RSET \<\< 250 2.0.0 Ok”  
  
  
  
I looked in the forum and followed all the tips (deleted cache,checked user/password into app/config/local.php… an so on) but it didn’ work for me. I am able to log to Gmail BTW. Just in case Send option is set to immediate. Any clue? Thank for your help.

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<div class="post-metadata">

**Author:** ![fbugalla](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/fbugalla/32/759_2.png) [@fbugalla](https://forum.mautic.org/u/fbugalla)\
**Post date:** [May 20, 2015, 10:22am UTC](https://forum.mautic.org/t/mandrill-smtp-error/1860/2 "2015-05-20T10:22:25Z")

</div>

Hello,  
I have been able to log with Mandrill at once with Mautic 1.0.4. Since I upgraded to 1.0.5 I am not able to log in anymore always getting this error when testing connection:

“Failed to authenticate on SMTP server with username "email@mydomain.com” using 1 possible authenticators  
++ Starting MauticCoreBundleSwiftmailerTransportMandrillTransport \<\< 220 [smtp.mandrillapp.com](http://smtp.mandrillapp.com) ESMTP \>\> EHLO [www.mydomain.com](http://www.mydomain.com)\<\< 250-ip-10-107-137-250 250-PIPELINING 250-SIZE 26214400 250-STARTTLS 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250 8BITMIME \>\> STARTTLS \<\< 220 2.0.0 Ready to start TLS \>\> EHLO [www.mydomain.com](http://www.mydomain.com) \<\< 250-ip-10-107-137-250 250-PIPELINING 250-SIZE 26214400 250-AUTH PLAIN LOGIN 250-ENHANCEDSTATUSCODES 250 8BITMIME \>\> AUTH LOGIN \<\< 334 VXNlcm5hbWU6 \>\> YWRtaW5AZXNjb2xlc251cmlhLmNhdA== \<\< 334 UGFzc3dvcmQ6 \>\> N2ZBWXlIYlA4Z01hQ3hfUQ== \<\< 435 4.7.8 Error: authentication failed: UGFzc3dvcmQ6 !! Expected response code 235 but got code “435”, with message “435 4.7.8 Error: authentication failed: UGFzc3dvcmQ6 " \>\> RSET \<\< 250 2.0.0 Ok”

I looked in the forum and followed all the tips (deleted cache,checked user/password into app/config/local.php… an so on) but it didn’ work for me. I am able to log to Gmail BTW. Just in case Send option is set to immediate. Any clue? Thank for your help.

---

<div class="post-metadata">

**Author:** ![silavapi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/silavapi/32/7424_2.png) [@silavapi](https://forum.mautic.org/u/silavapi)\
**Post date:** [February 2, 2020, 11:00pm UTC](https://forum.mautic.org/t/mandrill-smtp-error/1860/3 "2020-02-02T23:00:01Z")

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