Adding emojis to your email campaigns — including in the subject line — can help them stand out in a subscriber's inbox. SmartrMail fully supports emojis anywhere in your emails. For a deeper look at the research on how emojis affect open rates, see our blog post on using emojis in subject lines — results vary quite a bit depending on the specific emoji, industry, and audience, so it's worth reading before assuming any emoji is a guaranteed win.

Inserting emojis is as simple as copying and pasting them from a service like Get Emoji.

Emojis look slightly different depending on the platform — Apple, Google, Microsoft, and Samsung all have their own visual style for the same emoji. This means a subscriber sees whichever design matches their own device, not necessarily the one you saw while designing your email. The one complication: viewing an email in a client like Gmail on an iPhone may show Google's emoji design rather than Apple's, since rendering depends on the app, not just the device.
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Apple:

Google:

Microsoft:

Samsung:

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There's no way to force a specific emoji design for every subscriber. The designs are usually similar enough that this isn't a major concern, but if you want to double-check a specific emoji's appearance across platforms, Emojipedia lists the design variations for every emoji.

The vast majority of email clients render emojis correctly, in both subject lines and email content.
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Note: the main exception is Outlook 2003, which doesn't support emojis at all — they'll show up as rectangular boxes or glyphs instead. Additionally, Windows 7 and earlier can't display emojis regardless of which email client is used, since the limitation is at the operating system level. Both of these affect an increasingly small share of subscribers today, but are worth knowing about if you notice inconsistent rendering reports.
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Note: in Gmail specifically, an emoji can look different in the inbox preview than it does once the email is opened — Gmail sometimes uses two different rendering styles for these two contexts.

No — the same emoji renders differently depending on the subscriber's platform (Apple, Google, Microsoft, Samsung, etc.), though the designs are usually similar enough to convey the same meaning.
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Outlook 2003 doesn't support emojis, showing boxes or glyphs instead. Windows 7 and earlier also can't display emojis at the operating system level, regardless of email client.
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Not definitively — research is mixed. Some studies show a boost depending on the specific emoji and context, while others show no improvement or even a slight decrease. See our blog post on using emojis in subject lines for a fuller picture before assuming any given emoji will help.