gzip emails if there are too big

When sending email, gzip content if it exceeds 32kb.

added enhancement label

changed milestone to %v12.0.0

created branch 105-gzip-emails-if-there-are-too-big

mentioned in merge request !176 (merged)

asked by @marek.ostaszewski

closed via merge request !176 (merged)

closed via commit 40ffece9