Sending an email to Steve is impossible

[GG]

Every time I log on to the forum I'm met with a message that takes up half the space of my computer screen:

Hello GG,

If you have logged onto the forum, and found "Oop's, it seems this member has not updated the email address in their profile" under your username, it means that our system attempted to send you a greeting on the anniversary of your joining X Marks. For some reason however, the message was undeliverable.

There can be a few reasons for this but the most common is that you changed your email address and did not update the address here on the forum.

Bogus or throw-away email addresses are one of the give-aways of a spammer.
This is why we require all our members to have a valid email address in their personal profile and to keep it up-to-date.

We assure you that your email address is not visible to the public and we never give out or release personal information.

If you would please contact the forum owner, Steve Ashton via email, telling him that you have updated your email address, he will take this notice off your username.

steve@xmarksthescot.com

I do have changed my email address, but I have also updated it on my profile months ago, and I have several times tried to contact Steve. However, every time I try to send an email to steve@xmarksthescot.com, I get the message that it is undeliverable, because it is regarded spam.
It is not spam, of course, but what do I do to avoid this quite annoying message? I have also some months ago received an email from the admin, using my NEW address - meaning, it functions - telling me that it has to be updated?
It is greman@dress2kilt.eu and connected to my website, https://dress2kilt.eu.