Re: Gmail: multiple addresses in From:n550 5.7.1 header are not accepted Reply #15 – March 23, 2022, 11:33:51 pm Is that something that would be mentioned in phpinfo()? I don't run it from my VPS but from shared hosting (Hetzner). But it's Linux 4.19 with PHP 8.1.4.Quote from: Spuds – March 23, 2022, 11:22:45 pmIf I change it to CRLF the mail tests fail in our github actions testbed which is Ubuntu 20.04, so at least Ubuntu/Debian native sendmail expect only LF. Fails in which way? Sending a message locally won't care if it's all \n.