About that Gmail “Promotions” tab
It seems that a lot of people still misunderstand what the Gmail promotions tab is and does. How do I know this? Because I still get questions from time-to-time along the lines of “How do we get our mail out from the ‘Promotions’ tab and back into the inbox?” All that Google has done here
When systems disagree
A co-worker recently brought to my attention an interesting problem which involves differing ideas concerning precedence between RFC5321 and RFC3463. The result of the issue is that mail systems may experience unneeded delay in delivering mail. What’s going on? Gmail is returning the following error for over quota accounts: “452 4.2.2 The email account that you tried