In this article:
- Limit the use of punctuation characters
- Limit the total number of characters
- Keep away from misusing capitalization
- Avoid these spam filter trigger words
Emails with "spammy" subject lines will get sent straight to junk. Here is a set of rules to follow to help get your emails to your readers' inbox.
Limit the use of punctuation characters
Overusing punctuation is a trigger for spam filters. To help your mail reach your contact list's inbox, we are checking for more than 4 punctuation marks within the subject line (regardless of placement/position).
Limit the total number of characters
We recommend limiting the number of characters in your subject line to 50 characters to ensure that your subject line properly displays across all devices.
Limiting the total number of characters in your subject line will allow you to communicate the subject of your email without getting cut off when viewed on mobile devices.
Maximum characters: 140
Keep away from misusing capitalization
Using too much capitalization in your subject lines will send your mail to your reader's junk mail. To avoid getting marked as spam, we are checking for an inordinate amount of capital letters, i.e. greater or equal to 50% relative to the length of the subject line.
Avoid these spam filter trigger words
Adding certain words to your subject line can activate a recipient’s spam filter. To help get your emails to your member's inbox, we are scanning the email subject line for common words that have been known to trigger spam filters.