Email (comcast.net) not sending from Web Browser

I am having same issue as below (from another post). Can you clear filtration for my account as well? Thank you

@GregBorzo wrote:

I'm having email trouble. I receive email but when I reply or send a msg it never arrives at the destination. The sent msg shows up in my "Sent" folder but the recipient doesn't receive it. I even switched browsers (from Safari to Chrome), but the problem continues. 

 

I've checked our server and it shows you being filtered for spam. I've cleared this up and it should take effect within the hour.