Four more free email tools

Fill in your name, job title, company, phone, email and website, pick one of four styles and an accent color, and add social links if you want them. Fill with an example shows a finished signature in one click, and the preview updates as you type.

Copy signature pastes into Gmail, Outlook and Apple Mail with its formatting intact, and Copy HTML gives you the code for any other tool. It all runs in your browser, so nothing you type is sent anywhere.

Set how many sending inboxes you have, how many emails each one sends a day, how long they warm up, your sending days and the reply rate you expect. The calculator shows your daily and monthly volume, how many replies to expect, and a week-by-week chart of how sending ramps up from the day your inboxes go live.

Enter a domain or an IP address to see whether it is listed on public email blacklists. A domain is checked together with the addresses of its mail servers and website, and every address checked is shown.

Each list gets its own result. A list that does not answer is marked could not check instead of clean, and a listed result links to that list's own delisting page.

Paste an address before you send to it. The checker looks at the format, whether the domain has a mail server, throwaway inbox services, shared addresses such as info@ or sales@, free mailboxes, and likely typos, with a one-click Did you mean suggestion.

Every result says plainly that these are signals, not a mailbox check: it does not test whether the mailbox exists or whether the domain accepts every address.