Checks before you send

Last updated November 10, 2026

The editor checks your email as you write. The checks are suggestions, not rules: none of them stops you sending.

The copy checker

It runs inside the editor and underlines what it finds, with a one-click fix where there is one.

Spelling and grammar, in US or UK English, whichever your workspace uses (Settings, Business details).
Writing: a readability score, sentences over 25 words, passive voice, repeated words and an estimated reading time.
Subject line: a nudge when it's under 15 or over 60 characters. Most inboxes cut a subject off at about 60.
Spam words: phrases that spam filters tend to flag.
Email basics: images without alt text, merge fields without a fallback, and a missing preview text.
Broken links: see below.

Add your own words to your dictionary (up to 2,000) and they won't be flagged again.

Your writing is checked on our own servers in the UK. It is never sent to an outside grammar or AI service, and the checker never rewrites anything for you.

Link checks

We check up to 50 links in each email and flag any that are broken, time out or are empty.

We only look at each link. Checking never presses a button for you, so an unsubscribe or confirmation link in your email is safe.
Noosletter's own links, like unsubscribe and manage profile, are skipped.
Links to private or internal addresses are never opened.
Results are reused for 10 minutes.

Email size

Gmail cuts off emails over 102 KB and hides the rest behind a "View entire message" link. We warn you when your email reaches 90 KB, which leaves room for the footer. Large images are the usual cause, and we already resize images to 1,200 pixels wide for you.

The Send tab

Before you send, the Send tab shows:

Recipients: how many subscribers will get it, after every rule in Who you can send to. Anyone held back by today's limit still counts.
Copy checker: the same count of suggestions and broken links.
Growth checks: settings that would stop this email helping your newsletter grow, shown in red.
A test send to yourself. Test sends never count toward any limit.

The recipient list is checked again when sending starts, and once more just before each email leaves, so someone who unsubscribes in the meantime never gets it.

After you send

What you sent is saved exactly as it went out, with its recipients. Your reports always describe that version. You can still edit the email's web page afterward.

Spam reports and bounces on each email affect your sending. See Sending reputation.

The copy checker

It runs inside the editor and underlines what it finds, with a one-click fix where there is one.

Spelling and grammar, in US or UK English, whichever your workspace uses (Settings, Business details).

Writing: a readability score, sentences over 25 words, passive voice, repeated words and an estimated reading time.

Subject line: a nudge when it's under 15 or over 60 characters. Most inboxes cut a subject off at about 60.

Spam words: phrases that spam filters tend to flag.

Email basics: images without alt text, merge fields without a fallback, and a missing preview text.

Broken links: see below.

Add your own words to your dictionary (up to 2,000) and they won't be flagged again.

Your writing is checked on our own servers in the UK. It is never sent to an outside grammar or AI service, and the checker never rewrites anything for you.

Link checks

We check up to 50 links in each email and flag any that are broken, time out or are empty.

We only look at each link. Checking never presses a button for you, so an unsubscribe or confirmation link in your email is safe.

Noosletter's own links, like unsubscribe and manage profile, are skipped.

Links to private or internal addresses are never opened.

Results are reused for 10 minutes.

The Send tab

Before you send, the Send tab shows:

Recipients: how many subscribers will get it, after every rule in Who you can send to. Anyone held back by today's limit still counts.

Copy checker: the same count of suggestions and broken links.

Growth checks: settings that would stop this email helping your newsletter grow, shown in red.

A test send to yourself. Test sends never count toward any limit.

The recipient list is checked again when sending starts, and once more just before each email leaves, so someone who unsubscribes in the meantime never gets it.