Cold email deliverability for small teams sending from their own inbox

Deliverability is whether your email lands in the inbox, the spam folder, or nowhere. For a small team sending from its own Gmail or Outlook account, the rules are simpler than the tools that sell deliverability make them sound. Most problems come from four things: missing authentication, sending too much too fast, emailing bad addresses, and writing like a marketing blast.

1. Set up authentication first

Mailbox providers check that an email really comes from your domain. Since 2024, Google and Yahoo require it of everyone sending to their users, with stricter rules for anyone sending more than 5,000 emails a day to Gmail.

If you send as a personal Outlook.com account on your own domain, your SPF record must include Outlook's servers, or your email may go to spam. Google Workspace and Microsoft 365 business accounts walk you through it.

2. Send fewer emails than you think

• A new inbox: start with 5 to 10 a day and add a few each week.
• An established inbox: 30 to 50 cold emails a day is a sensible ceiling for one person.
• Spread them out. Ten emails across a morning look like a person; ten in one minute look like a script.
• More volume means more inboxes and more people, not one inbox working harder.

Audyense sets a daily limit on every connected inbox (30 by default, adjustable up to 100) and sends one approved email at a time, so a busy day can't turn into a burst.

3. Keep your bounce rate near zero

Bounces tell providers you're mailing addresses you don't know. Contact databases go stale as people change jobs: in one comparison we ran, 3 of 43 work addresses from a single provider failed verification, and those were records with emails attached. Verify before you send, and never re-send to an address that bounced.

1. Verify every address before the first email.
2. Treat "risky" or "catch-all" results with care: send to them in small numbers.
3. Add every hard bounce to a do-not-contact list automatically.

4. Make unsubscribing easy

A clear way to opt out keeps people from pressing "report spam", which hurts you far more than an unsubscribe. Include a short line and a link at the bottom, honour it straight away, and keep the address off every future list. For marketing email at volume, Gmail and Yahoo also expect one-click unsubscribe headers.

Audyense adds an unsubscribe line to every email, adds one-click unsubscribe headers when sending through Gmail, and puts anyone who unsubscribes or bounces on your do-not-contact list, which you can't accidentally override.

5. Write like a person

• Plain text or very light formatting. No images, banners or heavy HTML.
• No links in the first email, or at most one.
• No attachments.
• Short subject lines without capitals, symbols or "free".
• A real reason in the first line. Relevant emails get replies, and replies are the strongest signal to a provider that your mail is wanted.

6. Be careful with open and click tracking

Open tracking adds an invisible image; click tracking rewrites links. Both are common, both add a little risk, and both are less accurate than they look: Apple Mail loads images in the background, and security scanners click links before a person ever sees the email. If you track, treat opens as a rough signal and look at replies. Audyense counts automated opens and clicks separately so they don't look like interest, and lets you turn tracking off per inbox.

7. Watch the numbers

Should I use a separate domain for cold email?

Many teams send cold email from a second domain (for example, getacme.com instead of acme.com) to protect their main domain's reputation. It's a reasonable precaution at higher volumes. For a founder sending 10 to 30 careful emails a day, your real domain is fine and replies are more likely when the address matches your website.