Cannot receive email from Gmail users

[Graham15]

As the subject states, we cannot receive email from Gmail users, but (as far as we know) can receive email from everyone else.  The Gmail user does not receive a bounce; the email just vanishes.  I can reproduce the issue with my own Gmail account.

We have the spam filtering set to "Label message as Spam and keep in Inbox" but I checked the Spam and Trash folders just in case.  Spam Mail Options is empty and Filters is also empty.

Using Webmail, so no configuration issues to worry about with a mail client.

Anyone else?

[Graham15]

Update, we've now received about 1/3 of the emails (that we know about).

[rstra]

@Graham15 

I sent a couple of test messages, they came through, but were delayed for several minutes.

[mdk]

@Graham15 -- years ago, Shaw would "rate-limit" the number of messages from one specific BC university to various Shaw E-mail IDs.  So, after the first NNNNN messages, counting from 11 PM Pacific (midnight in Calgary/Edmonton), Shaw would block all further messages, until the next 11 PM Pacific.  So, delays were often 1 or 2 days.  Maybe, your ISP is rate-limiting messages from GMail users ???