Right now, email managers have an undeniable king, Outlook by Microsoft, but there are others that try to gain ground on it, such as Thunderbird or The Bat!, a classic amongst the email managers that want to regain the place that it should never have lost.
The best safe email client
To do so, The Bat! includes a series of spellcheck dictionaries, support for authentication by means of hardware with eToken Pro or iKey1000, transfer encryption by means of PGP, and even biometric authentication (if The Bat! is used at the same time as a server). But it isn't all security, and it also includes a simple and usable interface, and as a funny touch, it allows us to convert any emoticon into an image.
Like any good email client, it allows you to view HTML, it makes the antiviruses work a lot easier, it allows you to include signatures easily and make backups directly from the same program.
What's more, with the intention to cover as many professional fields as possible, The Bat! is perfectly compatible with Microsoft Exchange.