Notification emails not being received - it's happening again.

For a very long time I and others with certain email providers were not, or only very sporadically, receiving emails of notifications. This eventually seemed to get resolved and since about 23 March I have been receiving notification emails as expected.  However, the emails have stopped again, apparently but perhaps coincidentally, since the recent UKSI update.  Is this another issue set off by the update, or is there another reason?  Having to log in to the website everyday just to check for notifications is somewhat frustrating.