I want to send an email from my Gmail under another mail address.
(In this case, I want to use the mail service that I have at www.123-reg.co.uk)
Here what I've tried so far:
I clicked "Add another email address" at "Send mail as:" in the settings menu, and used this guide (from step 8):
When I've tried to use TLS with port 587 I receive this error message:
Authentication failed. Please check your username/password.
Server returned an error: "Unspecified Error (SENT_EHLO): Unable to send AUTH command over non ssl connection, code: 0"
And when I used SSL with port 465 I receive this error message:
Authentication failed. Please check your username/password and less secure apps access for firstname.lastname@example.org.
Server returned an error: "535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials o49sm108726oto.46 - gsmtp , code: 535"
I know that my Username and Password of 123-reg are the correct ones (because otherwise I wouldn't be able to enter the site), and the SMTP is smtp.123-reg.co.uk