Lettermint

Avoid Spam Filters During Holidays: Gmail & Outlook Tips Gmail and Outlook spam filters get stricter during Black Friday, Cyber Monday, and holidays. Learn how to keep your emails in the inbox, not spam.

Last chance to optimize your emails: lettermint.co/knowledge-b... #cybermonday

𝑹𝒆𝒂𝒅𝒚 𝒇𝒐𝒓 𝑪𝒚𝒃𝒆𝒓 𝑴𝒐𝒏𝒅𝒂𝒚?

In one week, your emails face the strictest spam filters of the year. Providers like Gmail & Outlook are already in holiday mode.

Make sure your campaigns are prepared
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What is SMTP and how does email sending work? SMTP is the protocol behind email sending. Learn what SMTP is, how it works, which ports to use, and why proper configuration matters for deliverability.

lettermint.co/knowledge-b...

𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲 𝗧𝗵𝘂𝗿𝘀𝗱𝗮𝘆 📚

SMTP: the backbone of email since 1982.

Every email you send travels through #SMTP servers, but how does it actually work? We explain the protocol that powers billions of emails daily.

Learn more
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Avoid Spam Filters During Holidays: Gmail & Outlook Tips Gmail and Outlook spam filters get stricter during Black Friday, Cyber Monday, and holidays. Learn how to keep your emails in the inbox, not spam.

Start preparing now: lettermint.co/knowledge-b... #blackfriday

𝑩𝒍𝒂𝒄𝒌 𝑭𝒓𝒊𝒅𝒂𝒚 𝒊𝒔 𝒂𝒓𝒐𝒖𝒏𝒅 𝒕𝒉𝒆 𝒄𝒐𝒓𝒏𝒆𝒓!

During the holiday season, spam filters from providers like Gmail & Outlook become much stricter. Your campaigns could suddenly end up in spam.

Don't let your campaigns end up in spam
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What is DKIM2 and what's the difference with DKIM? DKIM2 is the next version of DKIM with improved security and support for forwarded emails. Learn what DKIM2 is and why it matters for email authentication.

lettermint.co/knowledge-b...

𝗞𝗻𝗼𝘄𝗹𝗲𝗱𝗴𝗲 𝗧𝗵𝘂𝗿𝘀𝗱𝗮𝘆 📚

DKIM2 is coming, and it fixes what DKIM can't.

After almost 20 years, DKIM gets a major security upgrade. DKIM2 is currently in development and brings better email security. We wrote an article explaining what DKIM2 is and how it differs from DKIM.

Learn more
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Manage your account with the new Team API Manage your entire Lettermint environment via the API. The Team API is now in preview and offers full control over domains, projects, emails and more.

lettermint.co/changelog/t...

Lettermint Team API response

𝙏𝙚𝙖𝙢 𝘼𝙋𝙄 𝙞𝙨 𝙣𝙤𝙬 𝙞𝙣 𝙥𝙧𝙚𝙫𝙞𝙚𝙬! 🔗

Step up your integration game. Add domains, create projects, retrieve emails, and more via the new Team API. Perfect for integrating Lettermint into your existing workflows and systems.

Request access
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Email subdomain: what it is and when to use one Learn what an email subdomain is and why it's crucial for transactional emails. Including when to use subdomains and how to set them up.

Learn when to use them: lettermint.co/knowledge-b...

𝙆𝙣𝙤𝙬𝙡𝙚𝙙𝙜𝙚 𝙏𝙝𝙪𝙧𝙨𝙙𝙖𝙮 📚

Email subdomain: yes or no?

If your newsletter gets spam complaints, it can hurt your password resets too. Without subdomains, one bad campaign affects everything.

Email subdomains fix this:
- mail.yourdomain.com for transactional
- newsletter.yourdomain.com for marketing

Inbound Emails - Receive and Process Emails via Webhooks Receive inbound emails as structured JSON via webhooks. Process attachments, filter spam, and automate workflows with Lettermint's EU-based email service.

lettermint.co/features/in...

Showing an incoming email as JSON

𝑳𝒂𝒖𝒏𝒄𝒉𝒊𝒏𝒈 𝑰𝒏𝒃𝒐𝒖𝒏𝒅 𝑬𝒎𝒂𝒊𝒍𝒔 📨

Receive and process incoming emails as webhooks. Perfect for building support systems, contact forms, and email automation workflows.

Learn how inbound emails work!
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What is greylisting and why doesn't email arrive immediately? Email not arriving right away? Greylisting is often the cause. Learn what this antispam technique is, how it works and how to prevent email delays.

lettermint.co/knowledge-b... #greylisting #EmailDeliverability

Mail delayed because of a greylist

𝙆𝙣𝙤𝙬𝙡𝙚𝙙𝙜𝙚 𝘽𝙖𝙨𝙚 𝙏𝙝𝙪𝙧𝙨𝙙𝙖𝙮 📚

Greylisting is like a waiting room for unknown emails. Mail servers make new senders wait and retry: real senders come back, spammers don't.

The problem? Your password reset email gets delayed.
The solution? We knows the wait times and retries smartly.

Learn more
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Add inline images to emails with Content-ID (CID) Add inline images to emails with Content-ID, without external hosting. Perfect for logos, signatures and newsletters that remain always visible.

lettermint.co/changelog/i...

𝗖𝗼𝗻𝘁𝗲𝗻𝘁-𝗜𝗗 (𝗖𝗜𝗗) 𝘀𝘂𝗽𝗽𝗼𝗿𝘁 𝗶𝘀 𝗻𝗼𝘄 𝗮𝘃𝗮𝗶𝗹𝗮𝗯𝗹𝗲! 🖼️

Embed inline images directly in your emails without external hosting. Perfect for logos, email signatures, and newsletters.

See how to use it
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What is DMARC? If you send emails with your domain, you undoubtedly have a DMARC record in your DNS. But what is DMARC and what does it do? We'll explain it to you.

Ready to become the boss of your domain's security?

Full DMARC guide here: lettermint.co/knowledge-b...

#DMARC #EmailDeliverability

𝙆𝙣𝙤𝙬𝙡𝙚𝙙𝙜𝙚 𝘽𝙖𝙨𝙚 𝙏𝙝𝙪𝙧𝙨𝙙𝙖𝙮 📚

DMARC is the security chief that checks both the guest list (SPF) and wax seal (DKIM). It decides what happens to suspicious emails.

No DMARC? Fake emails slip through.
With DMARC? You control your domain's reputation.

Test your DMARC policy with our free checker!
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What is DKIM? DKIM adds a digital signature to your emails. Discover how DKIM works, why it's important, and how to set it up with Lettermint.

Want to add that royal seal to your emails?

Complete DKIM setup guide:
lettermint.co/knowledge-b...

#DKIM #TransactionalEmail #EmailDeliverability

𝙆𝙣𝙤𝙬𝙡𝙚𝙙𝙜𝙚 𝘽𝙖𝙨𝙚 𝙏𝙝𝙪𝙧𝙨𝙙𝙖𝙮 📚

DKIM is like a wax seal on your emails. It proves your message hasn't been tampered with during delivery.

No seal? Emails might be altered or spoofed.
With DKIM? Recipients know it's really from you.

Verify your DKIM signature with our free checker!
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Prevent emails from landing in spam with Spam Insights Spam Insights gives you visibility into all your emails sent through Lettermint and shows you how to keep your messages out of the spam folder.

Read more about Spam Insights: lettermint.co/changelog/p...

Lettermint Spam Insights

𝑳𝒂𝒖𝒏𝒄𝒉𝒊𝒏𝒈 𝑺𝒑𝒂𝒎 𝑰𝒏𝒔𝒊𝒈𝒉𝒕𝒔 🚀

Ever wonder why emails land in spam? Now you'll know exactly why. Get spam scores for every email you send, see what triggers spam filters, and improve your delivery.

Your emails deserve the inbox.
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What is SPF? SPF protects your domain against email abuse. Learn how to set up SPF, what the limits are, and how Lettermint cleverly handles SPF via Return-Path.

Ready to create your domain's perfect guest list?

Full SPF guide here:
lettermint.co/knowledge-b...
#EmailDeliverability #TransactionalEmail

𝙆𝙣𝙤𝙬𝙡𝙚𝙙𝙜𝙚 𝘽𝙖𝙨𝙚 𝙏𝙝𝙪𝙧𝙨𝙙𝙖𝙮 📚

SPF is like a VIP guest list for your domain. It tells email bouncers: "These servers are with me!"

No guest list? Party crashers (spammers) pretend to be you.
With SPF? Your emails get the VIP treatment.

Check who's on your list with our free SPF checker!
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Improved Suppressions Management Easily manage blocked email addresses with our improved Suppressions Management. Prevent unsubscribed contacts and bounces from accidentally being emailed.

🔗 lettermint.co/changelog/i...

Lettermint suppressions mangement

📮 New: Improved Suppressions Management
Managing blocked email addresses just got a whole lot easier.

→ Complete overview of all suppressions across projects
→ Filter by type, date, or email address
→ Remove addresses from blocklist with one click
→ Automatic checks before every send

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Test emails with our test email addresses and prevent problems Send test emails using our test email addresses and prevent your emails from being marked as spam or unsafe. Free to use for Lettermint customers.

Read more about our test email addresses:
lettermint.co/knowledge-b...

Testing emails? Stop using your own inbox! ✋

Use our test email addresses for your test emails. They're free and don't count toward your monthly limit.

🟢 ok@testing.lettermint.co
🟠 softbounce@testing.lettermint.co
🔴 hardbounce@testing.lettermint.co