What Is an Email Blast? How to Send One Without Blasting

An email blast is one email sent to everyone on a list at the same moment, with the same content for every reader. Eblast and e-blast are the same word, and in UK offices the usual name is an eshot.

Christmas grotto tickets go on sale at a family farm park near Carlisle, a business invented for this article. It emails all 6,000 of its contacts the same day.

Newsletter subscribers, annual pass holders, parents who once asked for a birthday party quote and contacts who have not opened an email in years all get the same message. That send is a blast.

What does email blast mean?

A send is a blast when three things are true:

• Everyone on the list gets it, whether or not the message fits them.
• Nothing in the email changes from one reader to the next.
• The whole send leaves in one go.

Change any one of the three and the email starts to become a targeted campaign. The phrase describes how an email goes out, not what it says. A sale, an event or a price change can all be blasted.

The term is American and informal. Email platforms call the same thing a broadcast or a campaign. Among marketers, "batch and blast" is a criticism: sending everything to everyone and hoping enough of it lands.

Email blast vs newsletter and email campaign

A newsletter is defined by its content and schedule, and an email blast by its audience.

A newsletter carries several items, like a small magazine, and arrives weekly or monthly.

So the two can overlap. A monthly newsletter sent to the full list is blasted each month. A one-off offer sent only to last month's buyers is no blast at all.

Email campaign is the neutral word for both: a single email for a group of contacts, whichever group you choose. MailGraf calls each one-off send an email campaign, whatever the audience.

Why a whole-list email blast hurts delivery

A whole-list send includes the contacts least likely to want it, and mailbox providers judge your email partly by how those people react.

Every list gathers addresses whose owners forgot signing up, changed job or stopped reading.

Gmail works out each sender's spam rate day by day, so most of a blast's complaints are likely to land in a single day's figure, the one Google's spam rate limits are measured against (Gmail sender guidelines FAQ, checked 25 October 2026).

Size can change how Gmail treats you for good. Anyone who sends close to 5,000 messages or more to personal Gmail accounts within 24 hours becomes a bulk sender.

Mail from subdomains of the same domain counts towards that figure, and the FAQ says the status never expires. If 5,000 of your contacts have Gmail addresses, one blast is enough. The stricter rules that follow are set out in what Gmail, Yahoo and Microsoft require from senders.

Dead addresses add a risk of their own. On the park's 6,000 contacts, 300 hard bounces would be enough for MailGraf to pause the account's sending until it is reviewed (sending and list rules).

Is an email blast legal in the UK?

Yes, if every person on the send may receive that particular email. A blast makes this hard to check, because one message goes to people who joined your list in different ways.

Under the Privacy and Electronic Communications Regulations (PECR), you need an individual's consent to send them marketing email. The exception, the soft opt-in, lets past buyers and enquirers who were offered an opt-out hear about your own similar products.

The Information Commission's Office (ICO) sets the test: would past dealings lead people to expect that marketing? Its guidance on the email rules gives supermarket and charity examples (as of 25 October 2026).

So a blast is only as safe as the narrowest permission on the list. The ICO counts asking for a quote as negotiating a sale. The park's party enquirers can therefore receive emails about birthday parties, but whether they would expect a grotto email is far less certain.

An offer from the café that rents the farm park's courtyard would be out for every soft opt-in contact, because the rule never covers another organisation's products.

Every email must also give a simple way to opt out. We have summarised the ICO page above; none of it is legal advice.

How to send blast emails from Gmail

Gmail gives you two ways to email a group, Bcc and mail merge, and a personal account stops at 500 emails a day. No single email can go to more than 500 recipients (Gmail Help, October 2026).

• Bcc. Paste the addresses into Bcc so nobody sees the others. The list stays private only while every address sits in that field, and Bcc goes wrong with customer lists shows the cost of a mistake.
• Mail merge. This one needs an eligible paid Google Workspace plan and stops at 1,500 recipients a day. Gmail sends each person a separate copy with its own unsubscribe link, and mail merge in Gmail has the steps.

Neither method knows who stopped reading, so neither can leave those people out. For a few dozen people who know you well, Gmail is enough. A list of 6,000 needs an email platform for the steps below.

How to send an email blast without blasting

Send the same news to the people it suits, in an order that lets you stop if something looks wrong. Five steps turn the grotto blast into that kind of send.

1. Split the list by how people joined

Most lists mix several sources, and each source carries its own permission. Sort contacts by where their address came from, then decide what each group gets.

Group	How they joined	Contacts	What they get
Newsletter subscribers	Signed up on the website for news and offers	2,200	The grotto email
Annual pass holders	Bought a pass and were offered an opt-out	2,300	The grotto email, with a pass holders' price
Birthday party enquirers	Requested a party quote and were offered an opt-out	400	A birthday party email instead
Contacts with no recent recorded activity	Joined in any of these ways, but had no recorded opens or clicks in their last 10 emails	1,100	A check on whether they still want emails before the grotto offer

The announcement now goes to 4,500 people, down from 6,000, and each of them has a reason to expect it.

2. Check contacts with no recent activity

An open is a recorded signal, not proof that someone read the email. Image blocking can hide a real read, while privacy tools can record an open without one. Check clicks and other recent activity before treating a contact as inactive.

For contacts with no useful activity signals, send a short re-engagement series. Exclude those who still do not respond from the offer.

3. Keep one email and change one part

Separate emails for each group are rarely needed. Put the part that differs in its own section and show it only to the group it fits. Pass holders see their price, and everyone else sees the standard one.

4. Send to your best readers first

Start with contacts who clicked or showed other recent engagement, then send to the rest a day later. If the first send brings bounces or complaints, you find out before most of the list has received it.

5. Give each person their own copy and a quick way out

An email platform sends a separate copy to every address, so no recipient sees the list. It also adds an unsubscribe link to each one.

Gmail expects marketing email from bulk senders to offer one-click unsubscribe, which lets a reader leave from the inbox without visiting a page. Google's sender FAQ also asks for unsubscribe requests to be honoured within 48 hours.

How MailGraf narrows an email blast

In MailGraf the blast has a name: All active contacts, the first choice on a campaign's Audience step. MailGraf removes unsubscribed and blocked contacts from every send by itself, and the other settings on that step do the narrowing.

• Choose Segments to send to the groups from step 1.
• Turn on Exclude specific recipients to remove a list, segment or tag. The ready segments Cold, engaged before and Cold, never engaged find the silent contacts from step 2. Save the ready cards as segments first, then exclude both.
• In the email editor, set a row's Show to option to contacts matching a condition, such as a pass holder tag, for step 3.
• For the first send in step 4, choose the saved Hot right now segment and exclude the party enquirers. For the second, choose the two grotto segments and exclude the two Cold segments, plus a segment built on the rule was sent for the first campaign.
• Under Sending frequency and recipient limit, Leave 24 hours between emails keeps a new pass holder who got the automated welcome this morning from getting the grotto email before tomorrow.

To see whether one send would cross Gmail's 5,000 mark, the ready segment Gmail addresses counts them. Estimated recipients shows the final total before anything goes out.

If your list has outgrown Gmail, compare the park's monthly send volume with the plans on the pricing page.

Open your last campaign report and compare the Non-openers and Non-clickers groups before saving an exclusion segment.