I run several email newsletters. One of them consistently gets marked as a "phishing" attempt by Gmail. They do not get marked as phishing if the email includes no links – but if I include a link, it immediately gets marked as phishing. This disables all of the links in the emails. I regularly get emails from subscribers complaining that the links do not work.
I once sent an email to all of the Gmail subscribers, asking them to explicitly mark my emails as trusted. Many of them did. But, it did not help – they still get marked as phishing attempts. I've implemented SPF and DKIM. It still didn't help.
The problem: Once an email is flagged as "phishing", the links are not clickable. On mobile, there is no way to make them clickable. Most users don't know how to make them clickable, even when it is possible.
All of the emails come from the same domain and the links are always to the same domain. All of them have the same basic format. Other email from this IP address gets through no problem. Google's Postmaster tools give the IP address a 100% reputation. I tried switching to a new sending service, to no avail. Nothing seems to work – no matter what I do, Gmail marks my emails as phishing.
I've contacted Google's postmaster, to no avail.
Basically, Gmail has made it very difficult for people to read the content I send them. There seems to be no way to convince Gmail that my emails are not phishing.