On 7/26/21 11:07 PM, Michael wrote:
On Monday 26 July 2021 07:39:09 pm William Morder via tde-users wrote:
I am still mystified about why the timestamps are apparently out-of-sequence, regardless who responded to whom. Did it really take nearly two days for an email to be delivered?
Ah, yeah it did! Short answer is it got hung up internal to gmx.net for those ~two days. Below are the very stripped down headers:
According to RFC 5321, section 4.5.4.1:
Retries continue until the message is transmitted or the sender gives up; the give-up time generally needs to be at least*4-5 days*. It MAY be appropriate to set a shorter maximum number of retries for non- delivery notifications and equivalent error messages than for standard messages. The parameters to the retry algorithm MUST be configurable.
4-5 days would appear to be the allowable amount of time to deliver an e-mail, before the server bounces it back to the sender.
https://datatracker.ietf.org/doc/html/rfc5321#section-4.5.4.1
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