regularly email my class from webwork. There's been no trouble, even
for classes of 80 students or so, until a couple weeks ago. Now if I
send email to the class I get dozens of errors of the following type:
Failed to open the mailer for user leibfarth: Service not available. Reply: 421 4.3.2
Connection rate limit exceeded.
For now, I can get around the problem by sending emails in packets of
15 or so. But even then I need to wait a few minutes between packets,
or I get the same errors. This also means I send mail to students who
already dropped the class, since they show up in the manual email menu.
So far we have no idea what could have suddenly caused this problem.
Thanks a lot!
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