FTP file download using Wget

You might also try HTTrack which has, IMO, more flexible and intuitive include/exclude logic. Something like this...

httrack "https://example.com" -O ExampleMirrorDirectory \
"-*" \
"+https://example.com/images/*" \
"-*.swf"

The rules will be applied in order, and will override previous rules...

1. Exclude everything
2. But include https://example.com/images/*
3. But exclude anything ending in swf

So you are running a wget command, but can not issue wget -h? :)

FTP options:
       --ftp-user=USER         set ftp user to USER.
       --ftp-password=PASS     set ftp password to PASS.

So your command becomes

wget -r --ftp-user="serveradmin@mydomain.ca" --ftp-password=somepassword ftp://s12345.gridserver.com/path/to/desired/folder/

You most likely will have to put " " around the username because it contains @ character