Web2 Oct 2024 · The meaning of that RC57 in the API return code reference guide is : DSM_RC_REJECT_CLIENT_DOWNLEVEL or Session rejected: Downlevel client code … Web17 Jan 2024 · Ivor Trueman. 1/17/20 #27730. All emails to one of my groups members are bouncing. From the Email Delivery they all have "smtpin.zoho.com: 541 5.4.1 Mail rejected by destination domain" listed as the reason & under the most recent unsuccessful attempt it states "smtpin.zoho.com: read tcp4 66.175.222.12:39628->8.39.54.120:25: i/o timeout".
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