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  • We have that error, and the sending mailserver has the following SMTP dialog: [...] SMTP<< 250 Requested mail action okay, completed will write message using CHUNKING SMTP+> BDAT 1450 SMTP<< 250 Requested mail action okay, completed SMTP+> BDAT 39361 LAST (I'm on the sending side and can debug there) - The watchguard side…