Can send test mails but not from contact page

[SpeedBullet]

Hi, I configured SMTP with my server info and also an IMAP account. On the admin page I clicked the "test connection" button and it reports that it was succesful. Next, I clicked "send test mail" and this mail also gets sent successfully. I also receive the test mail correctly. Emails also get imported correctly, both sent and received mails.

Then, when I go to a contact and compose an email and click "send", it doesn't work! I get the following message:

error 500: incorrect authentication data

Next, when I check the data/logs/LOGFILE-of-today

[2016-08-26 22:24:09] Espo.ERROR: API [POST]:/:controller, Params:Array ( [controller] => Email ) , InputData: {"status":"Sending","to":"info@b.......m","nameHas h":{"info@b.......m":"Test Person"},"isRead":true,"isImportant":false,"inTras h":false,"folderId":false,"isUsers":false,"isHtml" :true,"isSystem":false,"isJustSent":false,"assigne dUserId":"1","assignedUserName":"My Name","attachmentsIds":[],"attachmentsNames":{},"attachmentsTypes":{},"body ":"<p><br></p><br><p><br></p><p>Kind regards,<br>My Name again<br></p>","subject":"this is the subject","from":"info@b...........e","cc":"","bcc" :"","parentType":"Account","parentName":null,"pare ntId":null,"selectTemplateName":null,"selectTempla teId":null,"bodyPlain":"\n\n\n\n\n\n\nKind regards,\nMy Name again\n\n\n"} - Incorrect authentication data [] []
[2016-08-26 22:24:09] Espo.ERROR: Display Error: Incorrect authentication data , Code: 500 URL: /api/v1/Email [] []

What could be the problem? Sending test mails works, but not sending a mail via the contact>compose function... PS I removed some data for privacy reasons.

[yuri]

Hello,

Do you send emai from system email address? Maybe it uses SMTP credentials from Preferences or Personal Email Account?

[SpeedBullet]

Yes I'm the only user on this new setup. So system / user account is the same. Sending mail works when I don't use SMTP but I need to use SMTP. Is it possible to debug this more deeply? Strange thing is that sending test mail works but a mail from the "compose" screen doesn't work.

[iscon]

Copy your email_address table and entity_email_address to soemthing else. Empty both and enter a new email for your contact. Try again. Sometimes corrupted email addresses cause this strange error.

[yuri]

Maybe it tries credentials form Preferences since system and user's addresses are same.

[SpeedBullet]

iscon your suggestion didn't work out. Still the same error
yuri yeah it's possible. What can I do to help debug this problem?

[yuri]

If user's email address the same as system email address. Try to fill credentials in your preferences.

[SpeedBullet]

I discovered that in my user preferences, the SMTP username had an extra space behind it. Invisible to the eye but still there and preventing the login from being successful. Embarrassing! I removed the extra space and now of course it works. Thanks for pointing me in the right direction. Perhaps a trim() onsave would have been useful to prevent this (copy/pasted and accidentally added space).

[yuri]

I will check. Thanks