3 years ago I wrote a short rant highlighting that many big email providers fail to make even preliminary efforts to improve the deliver-ability of their email.

3 years on I note the situation is now worse. The RFC-Ignorant list I referred to then, now has additional records for hotmail. There are now other widely implemented statistical systems using this list. Thus making it more important to sort these details out.

The topic came onto my radar again when someone testing their own email address hit an issue, one of the contributing factors was a 7 year old listing of their provider (Verizon) on RFC-Ignorant.

If you have a lot of trouble with email being falsely marked as spam, perhaps you are using the wrong provider.

They may be "too big to block", but they aren't "too big" to leave.

Friends don't let other friends use {hotmail|Yahoo!|orange.fr|....}