Can you create a small script that shows the error? In SmtpEnveloper, NamedAddresss are converted to Address instances, so I fail to see how you can get the Sender Name in the SMTP commands (same for recipients).

Hello @fabpot ,

Here is my current code:

<?php
        $email = (new TemplatedEmail())
            ->from(new NamedAddress('sender@test.com', 'Sender'))
            ->to(new NamedAddress('recipient@test.com', 'Recipient'))
            ->subject($subject)
            ->text('Some content');

        $this->mailer->send($email);

The current implementation will result in (DATA is not displayed properly in GH but works fine):

1. MAIL FROM:<Sender <sender@test.com>>\r\n
2. RCPT TO:<Recipient <recipient@test.com>>\r\n
3. DATA:\r\n From: Sender <sender@test.com>\r\n To: Recipient <recipient@test.com>\r\n

The following exception is thrown: Expected response code "250" but got code "553", with message "553 <Sender <sender@test.com> Invalid email address.".

Working behavior is/should be:

1. MAIL FROM:<sender@test.com>\r\n
2. RCPT TO:<recipient@test.com>\r\n
3. DATA:\r\n From: Sender <sender@test.com>\r\n To: Recipient <recipient@test.com>\r\n

Note that this issue has been identified using Amazon SES SMTP transport which internally uses the Symfony\Component\Mailer\Transport\Smtp\SmtpTransport::doSend method.

Last, note that the sender property of the DelayedSmtpEnvelope is null, but $enveloppe->getSender() will resolve a NamedAddress instance on request.

Are you using the component without any modification? I fail to see how that's possible. I've even created a small script to test it and I'm not able to reproduce your behavior.

No changes at all (just rm/reinstalled vendors to be sure). BTW, the only requirement I have in my composer file is symfony/amazon-mailer using a dsn like the following smtp://$AWS_ACCESS_KEY:$AWS_SECRET_KEY@ses?region=eu-west-1

Composer info:
symfony/amazon-mailer v4.3.1
symfony/mailer v4.3.1
symfony/messenger v4.3.1

Got it now! Working on a fix.

@xavismeh see #31992 for the fix.