Most newsletter problems repeat from company to company. Emails don't get opened, don't get clicked, get flagged as spam — and every time, the cause is one of a handful of typical mistakes. Let's go through them one by one.

No segmentation — everyone gets the same thing

Sending one email to your whole list is convenient, but ineffective. A new subscriber and a customer with a purchase history expect different content. When everyone gets the same email, part of the audience ignores it and part unsubscribes.

The minimal segmentation to start with: new subscribers, active customers, and people inactive over the last 90 days. That's three different communication scenarios with three different goals.

The subject line gives no reason to open

The subject line decides whether an email gets opened or not. Yet most companies write their subject lines at the last minute and never test them.

Weak subject lines: "April company news," "A special offer for you," "Don't miss out." Strong subject lines are specific, point to a clear benefit, or spark curiosity without manipulation.

A simple rule: if a subject line could be used for any other email, it's too generic.

Examples of strong subject lines in an inbox — a specific question, a genuine, personal tone, intrigue without manipulation. Subject lines like these give people a reason to open the email.

The email isn't adapted for mobile devices

More than half of all emails get opened on a phone. If an email isn't adapted for mobile, the text is tiny, the buttons are hard to tap, and images spill off the edge of the screen. The reader closes the email within seconds.

Basic requirements for mobile adaptation: an email width of no more than 600 pixels, a font size of at least 14px, buttons at least 44px tall, and a single-column layout for phones.

One call to action gets replaced with several

The more buttons and links an email has, the fewer clicks each one gets. This is called the paradox of choice: when there are too many options, people don't pick any of them.

Most emails should have one main button with one action. If you need to offer several things, it's better to send several emails than to overload a single one.

The exception is digests and roundups, which by nature have lots of links. Even there, though, it's worth highlighting one main piece.

The email goes out without a preheader

The preheader is the text that shows up in the inbox list right after the subject line. Most companies ignore it, so the mail client automatically pulls in the email's first few words — often something like "If this email doesn't display correctly, click here."

The preheader is an extra 80–100 characters that influence the decision to open an email. Use them to build on the subject line or add a second argument.

Emails go out to the whole list, including inactive subscribers

Regularly sending to the inactive part of your list lowers your domain's reputation. Gmail and Yandex notice the emails are being ignored and start routing them to spam — even for active subscribers.

Subscribers who haven't opened an email in 90 days should be split into their own segment and either enrolled in a reactivation sequence or removed from the list. A smaller, highly engaged list performs better than a large one with low engagement.

No consistent style or brand recognition

If every email looks different — a different font, different colors, a different structure — subscribers never build an association with the brand. The email looks like a random blast, not a message from a company they trust.

A master template with fixed elements — header, footer, button, color palette — solves this problem once and for all. Every email gets built from the same blocks and looks instantly recognizable.

Emails don't get checked before sending

Typos in the subject line, broken links, images that fail to load, an incorrectly inserted subscriber name — all of this gets discovered only after the email has already gone out. By then, there's no fixing it.

A minimal pre-send checklist: a test email to a few addresses, checking the links, checking how it displays on mobile, and checking the subject line and preheader.

On the left, an email with an image that failed to load and a broken button — impossible to fix once it's sent. On the right, a Timeweb Cloud email with a working design and a clear structure.

Emails go out without UTM tags

Without UTM tags, there's no way to tell which email drove a purchase or a visit to the site. Your analytics just show "traffic from email" with no breakdown by campaign.

UTM tags get added to every link in an email and pass data about the source, campaign, and specific email to Yandex Metrica or Google Analytics. It takes a few minutes but gives you the full picture of every newsletter's performance.

Newsletters run without a content plan

Emails go out whenever there's something to say, or whenever someone remembers the newsletter exists. The result: subscribers get three emails in one week, then silence for a month. That kills the habit of opening emails.

A content plan for the month ahead doesn't need to be detailed. It's enough to lock in categories and rough dates: value, news, sales. It's easier to come up with a specific topic once the format is already set.

Summary

Most of these mistakes only need fixing once: set up segmentation, build a master template, add UTM tags, put together a content plan. None of it takes major resources, but it fundamentally changes your results.

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