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We set up a Google business account. When the 'send mail' script send mails the mail goes to the recipient looking normal to the recipient:
If you hover over the name you see this:
(you can change the mailroom to anything you like)
In the sendmail setup you put the sender's email address as the 'reply to' addres so that any response goes to the sender.
Then no ugly warning signs.
I only read the instruction, not yet tested, but it says
Note: You may not be able to create an App password for less secure apps. Learn more about allowing less secure apps.
It also says
When you sign up for 2-Step Verification, we normally send you verification codes. However, these codes do not work with some apps and devices, like Gmail on your iPhone or iPad, Thunderbird, and Outlook. Instead, you’ll need to authorize the app or device the first time you use it to sign in to your Google Account by generating and entering an App password.
I have tested latest Thunderbird, it can send/recieve mail from Gmail (without 2-step verification setting) using OAuth on SMTP/IMAP, without "allowing less secure apps".
So I'm a bit confusing, Google says Thunderbird as "less secure app" but is it now become "secure app" ?
just setting up a business account and setting the account in the reply, etc is not enough to keep the security block from happing. That is how this solution is set up already. Of course we can change the settings to "allow less secure apps" but I was looking for another option. I'm going to try the app password and see if that works but haven't had time yet.