Only the size issue is a little more complicated

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The size of the matter
If your email were a book, the subject line would be the cover. And while everyone says "you shouldn't judge a book by its cover," that's exactly what people do when they're in their inbox.

For this reason, think carefully about the subject you choose. This is what will entice teacher data readers to open your message or not.



The truth is that the number of characters a person can read varies according to:

The device (tablet, cell phone or computer);
The internet browser ( Chrome, Internet Explorer , email application etc.);
And the email server ( Gmail, Yahoo!, Hotmail etc. ).
Since you can't control these variables, use common sense and follow the majority's values: typically, people can only see the first 55 characters of the subject line.

This would be if the message were being viewed on a computer; if the recipient were on a cell phone, they would only be able to see the first 47.

If you have any doubts, be sure to test the length of your subject line using this tool .

Despite this, do not forget what we discussed at the beginning of the text and always evaluate the performance of the matters you intend to use.

Until you find the ideal size for your audience, run A/B tests. Send a larger subject line to part of your contact base and a shorter subject line to the rest. Then just see which one had the highest open rate.

If the same result is repeated several times, you already have a good indicator of what size you should use in the future.

The size of the preheader
If you use an automation tool, you can also include a small supporting text (or preview text ) to complement the subject line.