Hello everyone, Question for the email gurus, I have a few sites running on my server, all have a registration option and emails must be verified, thus, an email is sent out. This works perfectly with all email providers as far as I can see and through testing. Except one site, emails from this site work fine but only with gmail they are delayed for 5 min. When testing, literally delivered instantly to my zoho mail account, outlook account, and 4 other providers I tested. The strange thing is, the delay only hits the activation email, any other email triggered, such as forgot password, to a gmail account gets delivered immediately. I know this is not a centmin issue, nor a server issue in general or else why would it work with every other provider. I've verified my mx, and analyzed the headers on mxtoolbox. I'm not sure if this has something to do with it and gmail doesn't like it, maybe, My mx is zohomail but I use php mail to send out these sites' emails. I do have the servers email added to the spf line alongside zoho, and i have a dmarc line in addition to dkim signing. I really don't know what gmail's issue is, and I filled out their contact form, but since this is google I'm not expecting a reply anytime soon, if ever. Another hunch I have is maybe they don't like the content, maybe it's too generic or matches something they don't like, i don't know. The emails are ultimately never blocked and literally 5 min on the dot later they appear in the inbox, not even the spam folder. Has anyone ever experienced or seen anything like this before.