caja-sendto does not send Email with file (from terminal or by "Send To" GUI option)

[Norbert]

Steps to reproduce:
1. Install Ubuntu MATE 20.04 LTS
2. Configure Email account in the default E-mail client - GNOME Evolution
3a. Open Atril, open some file in it (for example /usr/share/cups/data/default-testpage.pdf ), select File->Send To
3b. Open terminal and execute command `caja-sendto /usr/share/cups/data/default-testpage.pdf`
4. In the *Send To...* window set *Send as* to *Email* and provide correct E-mail address in *Send to*, click *Send*

Expected result:

* caja-sendto sends e-mail with the file attachment to the specified e-mail address

Actual results:

* caja-sendto does not send e-mail, opens Evolution main window instead

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: caja-sendto 1.24.0-1
ProcVersionSignature: Ubuntu 5.4.0-14.17-generic 5.4.18
Uname: Linux 5.4.0-14-generic x86_64
ApportVersion: 2.20.11-0ubuntu16
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Feb 24 11:44:28 2020
InstallationDate: Installed on 2020-02-19 (4 days ago)
InstallationMedia: Ubuntu-MATE 20.04 LTS "Focal Fossa" - Alpha amd64 (20200219)
SourcePackage: caja-extensions
UpgradeStatus: No upgrade log present (probably fresh install)

[Norbert (nrbrtx)]

What is interesting - it works normally if I install Thunderbird and specify it as default e-mail application.