honestly, it could be the comcast email. modern email systems are quite paranoid about spam and i feel like it's more likely for an ISP like comcast to be misconfigured than, say, google or outlook. have you considered setting up a new account on gmail or outlook for furry/business purposes?

i can't remember the last time i saw someone use an ISP email now that i think about it...

yes Comcast emails are usually blacklisted

Set up a free gmail account. I have several. One used for online transactions another for work related stuff

I use cox email and msn as my main 2 and havent had isues but like others said maybe comcast emails get sent to spam though if thats the case its really stupid.having a hotmail or gmail etc account cant hurt.they are free to set up after all. Ive had my Rick2Tails msn one since 1998? or something like that

You might try Telegram or Discord, those are used very heavily (especially Telegram) in con-space.

Hello, since you mentioned other cons, just in case you tried to contact Carolina Furfare, I know many of the staff there and if you do need, I can at least get Carolina Furfare staff in contact with you. Just in case. I hope you can get in touch with MFF staff! *hugs*

I hope it ends up working out for ya. I won't repeat what others have said since it's been said enough; so just wishing for the best!