POP3 connect error.

%3CLINGO-SUB%20id%3D%22lingo-sub-1181093%22%20slang%3D%22en-US%22%3EPOP3%20connect%20error.%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1181093%22%20slang%3D%22en-US%22%3E%3CP%3EExchange%202019%20standalone%20new%20installation.%20POP3%20allowed%2C%20POP3-service%20running%2C%20mailbox%20created.%20Mailbox%20is%20accessible%20by%20OWA.%20When%20I%20try%20to%20connect%20manually%20to%20the%20POP3%20server%20I%20got%20an%20error%3A%3CBR%20%2F%3E%2BOK%20The%20Microsoft%20Exchange%20POP3%20service%20is%20ready.%3CBR%20%2F%3EUSER%201CUser%3CBR%20%2F%3E%2BOK%3CBR%20%2F%3EPASS%20MYPassWord826%3CBR%20%2F%3E-ERR%20Server%20Unavailable.%2021%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1181093%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%20Server%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-1183945%22%20slang%3D%22en-US%22%3ERe%3A%20POP3%20connect%20error.%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1183945%22%20slang%3D%22en-US%22%3E%3CP%3EHi%20%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F562788%22%20target%3D%22_blank%22%3E%40Livitin_Serg%3C%2FA%3E%26nbsp%3B%2C%20have%20a%20look%20at%20%3CA%20href%3D%22https%3A%2F%2Fsocial.technet.microsoft.com%2FForums%2Foffice%2Fen-US%2F55fb3651-beef-45ba-8f91-69d54305d85f%2Ferr-server-unavailable-21-exchange-2013%3Fforum%3Dexchangesvrclients%22%20target%3D%22_self%22%20rel%3D%22noopener%20noreferrer%20noopener%20noreferrer%22%3Ethis%3C%2FA%3E.%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Frequent Visitor

Exchange 2019 standalone new installation. POP3 allowed, POP3-service running, mailbox created. Mailbox is accessible by OWA. When I try to connect manually to the POP3 server I got an error:
+OK The Microsoft Exchange POP3 service is ready.
USER 1CUser
+OK
PASS MYPassWord826
-ERR Server Unavailable. 21

 

1 Reply
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Hi @Livitin_Serg , have a look at this.