I have tried setting up a Comcast SMTP but it is not working

I tried SMTP as you suggested but can't get it to work.  I have a simple form called Test SMTP.  It contains one field (email) and is set up to Autorespond to the typed-in email address.  It uses SMTP parameters as recommended by Comcast, and uses the Sender email account heritagecf@comcast.net.  But when I enter an email address into the form, it does not send any Autorespond email.  I can type in a comcast email address, or a yahoo email address - it doesn't work in either case.  Have I set up the SMTP address correctly?  What is going wrong?   --Ted Hatch

www.heritagechorale.org/fair/index_jotformSMTP.html

I have replied to your first thread regarding the notification email. It seems that Comcast is blocking the emails although our log says the emails are sent.

I have suggested the Gmail SMTP, you may consider using this method while we are waiting for an update from our developers.

https://www.jotform.com/help/392-How-to-Use-Your-Gmail-Account-as-Your-Email-Sender-via-SMTP 

As you suggested, I tried to use my gmail address with SMPT as the "sender
email" for Autoresponder emails. But it did not work. My form "Test SMTP"
did not send an Autorespond email to xxx@yahoo.com or to xxx@comcast.net.
...

Did you check the spam folder? If you find the notifications there, make sure to mark them as NOT SPAM.

Yes, I always check the Spam folder.  The Autoresponder emails were not there.

More information: It didn't work initially because Google objected to
having an app (namely JotForm) send emails from my gmail address. So I had
to tell Google this was OK. Then I tried my "Test SMTP" form again, and
again I did not receive any Autoresponder email to comcast or yahoo. BUT
Later I did finally receive an Autoresponder email sent to my yahoo.com
address, but it took awhile. However, no Autoresponder email was received
at my comcast.net address.
...

The authentication is still through our servers/IP Addresses, so maybe Comcast detected that and blocked the email. I believe Comcast is blocking us so what we can do now is to wait for our developers to update us regarding this matter. I am sorry, but I see no other workaround to make Comcast email work in your form. We have resolved this before, but it seems like the problem happened again.