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I’m using my company’s own relay server and I’m having trouble with e-mails ending up in the trash because the relay is only configured for IPv4 but the plugin/webserver is using IPv6 for the relay connection. I tried using the IPv4 address as SMTP Host but your plugin only responds with “Could not connect to SMTP host” then, the relay server should be configured for this correctly though.
Is it possible to force the use of IPv4 in the WP Mail SMTP plugin?