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![Getting Error CNC-SDS-0335 Error returned from SMTP server. The error message was: [535 5.7.8 Error: authentication failed from <IP>]. The message could not be sent.](https://www.ibm.com/support/pages/system/files/support/swg/cogtech.nsf/0/012e928b717190a08525805a00428960/Symptom/0.240.jpg "Getting Error CNC-SDS-0335 Error returned from SMTP server. The error message was: [535 5.7.8 Error: authentication failed from <IP>]. The message could not be sent.")
Getting Error CNC-SDS-0335 Error returned from SMTP server. The error message was: [535 5.7.8 Error: authentication failed from <IP>]. The message could not be sent.
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Getting this error message: The message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com was lost in the middle of | Thunderbird-ondersteuningsforum | Mozilla Support
SMTP Server Status Codes - Answers That Work
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SMTP ERROR CODES
