subject field (2)
teemaväli, teemarida
= subject line
olemus
meilipäise element, mis esitab e-kirja teema
ülevaateid
https://sendpulse.com/support/glossary/subject-line
https://blogs.constantcontact.com/good-email-subject-lines/
https://www.businessemailetiquette.com/use-the-subject-field-properly/
https://optinmonster.com/101-email-subject-lines-your-subscribers-cant-resist/