Problem with POP server and UTF8 capability

[Niccolo Rigacci]

It is not possible to receive mail using the POP3 protocol if the server supports the UTF8 Unicode capability. It is required to remove the flag to the "Enable UTF-8 Extension, when the server supports it" option in server configuration.
The problem seems to be that Evolution sends the following commands to the POP3 server:

CAPA
UTF8USER loginname
PASS password

As you can see, there is a missing newline after the UTF8 command.

I verified this by sniffing the traffic at both client and server sides, with SSL disabled.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: evolution 3.36.4-0ubuntu1
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: MATE
Date: Fri Dec 11 17:16:53 2020
InstallationDate: Installed on 2020-05-04 (221 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
SourcePackage: evolution
UpgradeStatus: No upgrade log present (probably fresh install)