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RSS SMTP EHLO sends [127.0.0.1] instead of server hostname (Symfony Mailer migration)

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Description:

After upgrading from XenForo 2.0.6 to 2.3.9, outgoing SMTP emails intermittently fail with 421 rejections from Google's SMTP relay (smtp-relay.gmail.com). The error message:

Expected response code "250" but got code "421", with message "421-4.7.0 Try again later, closing connection. (EHLO)"

The root cause is that Symfony Mailer's EsmtpTransport defaults to EHLO [127.0.0.1] when no local_domain is specified. The previous SwiftMailer implementation automatically used the...

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