Strange email problem - Error in sieve filter

I just started getting this error in my mail program any time I receive an email from anyone (not when I send an email). When I receive an email to my inbox in "Mail" I also get a second email with subject "Internet Mail Delivery", which also has an attachment titled "Mail Attachment." It says:

Processing error occurred during delivery:

Recipient address: XXXXXXXXX@me.com
Reason: Error in sieve filter: Notify mailto: recipient is not a valid address.

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The attachment has a bunch of gobbeldy gook I don't understand (header information I think).

My ISP is Comcast. I don'[t[ know if this is an icloud issue, or a Comcast issue? Anyone have any experience with this type of thing?

UPDATE: I also see this in the Internet Mail Delivery email: Reporting-MTA: dns;ms03531.mac.com (tcp_intranet-daemon) Maybe that's a clue?

I just got off phone with senior Apple support. They have submitted the issue to Engineering and (with my permission) put my account in Trouble Shooting mode. It sounds like its one of their survers having issues. Will post more when I know more.

Weaselboy said:

Article here on this problem.

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Yep, that's exactly my problem. However, as of 9:50PM Mountain time, the problem seems to have resolved. Not getting that error message any longer with new inbound mail. Hopefully they've got it fixed.

UPDATE: Turns out it was an Apple iCloud Server issue - affected about 5% of iCloud email accounts.