SMTP server requires a secure connection and 5.5.1 Authentication Required

0.00/5 (No votes)

See more:

I am trying to send an email from my C# (Windows form application)

I got the error : The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required

EnableSsl = true
smpt port = 587
host = smpt.gmail.com

smtpClient.Send(msg); //Error come here

Thank in advance

Posted 14-Mar-13 22:06pm

Manoj Chamikara

Add a Solution

Comments

Richard MacCutchan 15-Mar-13 5:31am

Did you use a valid userid and password?

Manoj Chamikara 15-Mar-13 5:35am

Richard MacCutchan Yes I'm 100% sure i'm using correct username and password

Prasad Khandekar 15-Mar-13 5:32am

hello Manoj,

The gmail SMTP requires TLS/SSL connection which any way you seems to be using. The other most important thing is the Sender is required to authenticate him/her self using their gmail account before they are allowed to send/read emails. Try setting Credintials.

Regards,

Manoj Chamikara 15-Mar-13 5:37am

Prasad Khandekar Thank you
I'm new to C# I'm not clear can you more explain
How to correct my error

Richard MacCutchan 15-Mar-13 5:44am

Try a search of CodeProject, there hundreds of examples of this question complete with answers.

Manoj Chamikara 15-Mar-13 5:51am

Thank you

Richard MacCutchan 15-Mar-13 5:57am

You should always try searching before you post your question.

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Last 24hrs

This month

Pete O'Hanlon	180
OriginalGriff	80
Dave Kreskowiak	40
Rob Philpott	10
Andre Oosthuizen	10

Pete O'Hanlon	860
OriginalGriff	558
Richard MacCutchan	245
Dave Kreskowiak	120
merano99	120