As I’ve said tools are not always 100% working, so you needed all alternative products ready in your magic box.
I am using this product whenever my email-guessing won’t give me any luck on Sales Navigator for Gmail (formerly Rapportive).
Email-Format.com is so easy to use. You just have to enter the domain, and it gives you back the possible email format in one company. In high confidence level to low.
You can even check the ‘Representative Email Address’ tab.
Sometimes, email-format.com isn’t sure of some domain. Because you know, who has it all? Right?!
But they do still have few contacts result on Representative Email Address tab, which you can always use as a hint.
You can always use this product freely since creating an account isn’t necessary, unless if you go further to their pricing plans.