5 Embarrassing Subject
Line Mistakes to Avoid
The subject line is a make it or break it
moment for marketers. You have only a
few seconds to earn a subscriber’s
attention. Don’t squander the moment by
making a distracting error.
@LitmusApp
If you don’t have a good QA process in
place, you could end up accidentally
making one of these 5 embarrassing
subject line mistakes…
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1. Not overwriting placeholder text
2. Typographical errors
3. Broken personalization
4. Improperly inputted or unsupported
emojis and special characters
5. Awkward truncation
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Let’s look at each of these mistakes,
along with some real-life examples, and
then talk about some recommendations
on how to avoid them.
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Not overwriting
placeholder text
1
If you don’t have a good QA process set
up, placeholder text can accidentally
sneak through and get sent to your
subscribers. For example…
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
Typographical Errors
2
Typos are distracting and sometimes
quite embarrassing. An unnecessary
space (or a lack of spaces) can also
cause problems. For example…
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
Broken Personalization
3
When the personalization in your
subject line breaks, it makes your email
seem artificial and impersonalthe
exact opposite of what you were going
for. For example…
@LitmusApp
@LitmusApp
@LitmusApp
Improperly inputted or
unsupported emojis and
special characters
4
Emojis and special characters aren’t
supported in every email client, and can
look different even when they are
supported. Also, if they’re added
incorrectly, you can end up with code in
your subject line. For example…
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
Awkward Truncation
5
Having the text of your subject line get
cut off in the inbox can appear to
change your message in ways that are
distracting, confusing, or even super
embarrassing. For example…
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
@LitmusApp
If any of those examples
made you cringe, consider
adding the following to
your pre-send checklist…
1. Double-check the spelling, grammar,
and content of your subject line.
2. Ensure your personalization is
working and has default values set.
3. Preview your subject lines in all the
popular email clients.
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The Litmus Email Creative Platform
can make this quicker and easier. Our
Subject Line Checker provides….
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Real-time previews of your subject lines
and preview text in 15+ email clients
Alerts about issues
that could hurt your
email’s performance,
like unsupported
emojis and character
counts
Subject Line Checker is just one
of the many features available in
Litmus Builder, the code editor
we designed from the ground up
specifically for email development.
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To discover how Subject Line
Checker, Builder, and the rest
of the Litmus Email Creative
Platform can improve your
subscriber experience…
Start a free trial 

5 Embarrassing Subject Line Mistakes to Avoid