Merge branch 'Mail_sending' into 'master'

Fix email sending

See merge request !1
3 jobs for dsl2 in 21 seconds (queued for 6 seconds)
Name Stage Failure
failed
singularity-image Build
  sif         siftool is a program for Singularity Image Format (SIF) file manipulation
sign Attach a cryptographic signature to an image
test Run the user-defined tests within a container
verify Verify cryptographic signatures attached to an image
version Show the version for Singularity

Run 'singularity --help' for more detailed usage information.
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1