# Failed to authenticate on SMTP server
**URL:** https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server/2968
**Category:** Product Support
**Created:** [December 14, 2015, 9:20am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server/2968 "2015-12-14T09:20:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@katturaja](https://forum.mautic.org/u/katturaja)
#### Post date: [December 14, 2015, 9:20am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server/2968/1 "2015-12-14T09:20:49Z")
I have configured mautic other SMTP settings and when i was test connection and send test mail is working fine. When i am sending a email to lead i am facing following error.
* * *
SMTP Error
* * *
Failed to send to katturaja.m@tvsi.com: Failed to authenticate on SMTP server with username "katturaja.m" using 0 possible authenticators Log data: ++ Starting Swift\_Transport\_EsmtpTransport \<\> EHLO [127.0.0.1] \<\< 250-EXCHG1501.TVSi.Local Hello [10.91.17.85] 250-SIZE 31457280 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH GSSAPI NTLM 250-8BITMIME 250-BINARYMIME 250 CHUNKING
Array
* * *
Loaded Auth Handler is
* * *
Swift\_Transport\_EsmtpTransport Object
(
[\_handlers:Swift\_Transport\_EsmtpTransport:private] =\> Array
(
[AUTH] =\> Swift\_Transport\_Esmtp\_AuthHandler Object
(
[\_authenticators:Swift\_Transport\_Esmtp\_AuthHandler:private] =\> Array
(
[0] =\> Swift\_Transport\_Esmtp\_Auth\_CramMd5Authenticator Object
(
)
[1] =\> Swift\_Transport\_Esmtp\_Auth\_LoginAuthenticator Object
(
)
[2] =\> Swift\_Transport\_Esmtp\_Auth\_PlainAuthenticator Object
(
)
)
* * *
Telnet Details
* * *
telnet mail.tvsi.com 587
Trying 10.91.19.140...
Connected to mail.tvsi.com.
Escape character is '^]'.
220 EXCHG1501.TVSi.Local Microsoft ESMTP MAIL Service ready at Mon, 14 Dec 2015 14:48:03 +0530
EHLO mail.tvsi.com
250-EXCHG1501.TVSi.Local Hello [10.91.17.85]
250-SIZE 31457280
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH GSSAPI NTLM
250-8BITMIME
250-BINARYMIME
250 CHUNKING
I am stucking with this error from last three weeks please help me.
---
### Author:  [@katturaja](https://forum.mautic.org/u/katturaja)
#### Post date: [December 14, 2015, 9:20am UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server/2968/2 "2015-12-14T09:20:49Z")
## I have configured mautic other SMTP settings and when i was test connection and send test mail is working fine. When i am sending a email to lead i am facing following error.
## SMTP Error
Failed to send to [katturaja.m@tvsi.com](mailto:katturaja.m@tvsi.com): Failed to authenticate on SMTP server with username “katturaja.m” using 0 possible authenticators Log data: ++ Starting Swift\_Transport\_EsmtpTransport \<\< 220 EXCHG1501.TVSi.Local Microsoft ESMTP MAIL Service ready at Mon, 14 Dec 2015 13:41:20 +0530 \>\> EHLO [127.0.0.1] \<\< 250-EXCHG1501.TVSi.Local Hello [10.91.17.85] 250-SIZE 31457280 250-PIPELINING 250-DSN 250-ENHANCEDSTATUSCODES 250-STARTTLS 250-AUTH GSSAPI NTLM 250-8BITMIME 250-BINARYMIME 250 CHUNKING
Array
* * *
## Loaded Auth Handler is
Swift\_Transport\_EsmtpTransport Object
(
[\_handlers:Swift\_Transport\_EsmtpTransport:private] =\> Array
(
[AUTH] =\> Swift\_Transport\_Esmtp\_AuthHandler Object
(
[\_authenticators:Swift\_Transport\_Esmtp\_AuthHandler:private] =\> Array
(
[0] =\> Swift\_Transport\_Esmtp\_Auth\_CramMd5Authenticator Object
(
)
```
[1] => Swift_Transport_Esmtp_Auth_LoginAuthenticator Object
(
)
[2] => Swift_Transport_Esmtp_Auth_PlainAuthenticator Object
(
)
)
```
* * *
## Telnet Details
telnet [mail.tvsi.com](http://mail.tvsi.com) 587
Trying 10.91.19.140…
Connected to [mail.tvsi.com](http://mail.tvsi.com).
Escape character is ‘^]’.
220 EXCHG1501.TVSi.Local Microsoft ESMTP MAIL Service ready at Mon, 14 Dec 2015 14:48:03 +0530
EHLO [mail.tvsi.com](http://mail.tvsi.com)
250-EXCHG1501.TVSi.Local Hello [10.91.17.85]
250-SIZE 31457280
250-PIPELINING
250-DSN
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH GSSAPI NTLM
250-8BITMIME
250-BINARYMIME
250 CHUNKING
I am stucking with this error from last three weeks please help me.
---
### Author:  [@silavapi](https://forum.mautic.org/u/silavapi)
#### Post date: [February 2, 2020, 10:56pm UTC](https://forum.mautic.org/t/failed-to-authenticate-on-smtp-server/2968/3 "2020-02-02T22:56:31Z")