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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 [email protected].

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

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1 Answer 1

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You'll need to enabled "less secure" app access to your account.

First, go to your Google Account. On the left navigation panel, click Security. Near the bottom of the page, in the Less secure app access panel, click on "Turn on access (not recommended)": enter image description here

This will bring you to a new screen with a control to click on to enable this access: enter image description here

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    What you're talking about? There is nothing like "Less secure app access panel" in there: imgur.com/k15Y7M4
    – Hashirama Senju
    Commented Jan 22, 2019 at 0:20
  • @HashiramaSenju Hmm that's odd, maybe it's locale specific or something. I have added screen shots.
    – Michael
    Commented Jan 22, 2019 at 4:44
  • "Less secure app access panel" setting is not available for accounts with 2-Step Verification enabled. Such accounts require an application-specific password for less secure apps access. support.google.com/accounts/answer/185833?hl=en-GB
    – GorvGoyl
    Commented May 16, 2021 at 11:05

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