I have two domains hosted with the same company. I am using Apple Mail as my email client. The two email accounts are set up identically on Apple Mail.
When I send email from Apple Mail "most" recipients receive them; however, I know that @rogers.com do not for only one of them (goes to spam). The first email address is 16 characters (not including @ or .com), The second email is 13 characters (not including @ or .com).
Why is the first one going to spam and the second one isn't?
One additional oddity. The one that is at issue with Rogers.com recipient...I tried sending via gmail to test it out. No issue, rogers.com email recipient got it.
As a 15+ year email admin I'd say not very likely to not a chance. It may have been a case of just one too many links within the email in question.
Try running your email thru a spam check (scoring) site to see if improvements can be made without sacrificing the completeness of the message. Sometimes adding a URL to the corporate logo image satisfies the 'need' to have it multiple times but doesn't 'trip the spam filter' (as much).
Use those testing site to learn how to convey the same message with less rejection(s). If you follow their recommendations you may find conversions from blind mailings go up a few points. IE to the recipient (user) it seems less like SPAM and more like HAM.