1. a good reason for a 4xx after data could be that during the sending of a long message the disk of the server has been filled by another process. 2. To avoit whitelisting i now use another option. Before the actual message i send a dummy one, with just one line of message "see next one" . Then i write the message, then when i send my server has been whitelisted ... If someone expecially on lists) complains about that, i tell himm that to avoid this he should ungreylist me.
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