I have a Multisite installation where I'm facing somekind of bug relating the hostname used when WordPress sends emails (I've test it with WordPress admin emails and Contact Form 7).
For example, if I try to send an email from
email@example.com the email gets sent but the from address is somehow changed to
example-cname-id.elb.amazonaws.com is the alias I have in my DNS for the domain
site.example.com, which is one of the sites in the Multisite . Weirdly enough, if I instead try to send the email from
firstname.lastname@example.org the From Address doesn't change. The latter wouldn't be a workaround since I really need to send the emails from a subdomain hostname, which in this example would be
Some extra details:
- If I delete the CNAME record and replace it for an A record the From Address is not changed. Yet, this option would not work as a solution since it would require to change all the DNS and servers setup.
- I don't face this bug in single-site installations with a similar DNS set up (also using subdomains aswell).
- I'm using WordPress 4.9.8.
- The Multisite is on Subdomain mode.
has anyone ever faced a similar issue?