[Unit]
Description=Mailbox synchronization service
Wants=network-online.target gpg-agent.socket
After=network.target network-online.target dbus.socket gpg-agent.socket

[Service]
Type=oneshot
# workaround to allow relative executable invocation (i.e. current users' home dir)
ExecStart=/bin/bash -c '%h/.local/bin/sync-mail'