メールアドレスが変わりましたって英語でなんて言うの？

If you want to inform someone of a new email address, you cna say any of the following-

1. Please take note of my new email address.
   To "take note" of something means to be aware and pay attention"

2. In future, please correspond with me on my new email address, which is ....
   This statement is asking the sender to send and receive emails from the new email address instead of the old one.

3.I will no longer be using this email, instead please use this one in future.

"I have changed my email address" is a simple and formal way to say that your email address has changed.
"My email address has changed" is a very easy way to let someone know that your email address is different.
"I recently changed my email address" is a good way to let people know that you have a new email address.

The first 2 sentences are a polite, formal way of informing clients that you have changed your email address. These would be sent from your new email address, so you must sign off with your name.
The last sentence would be sent from your old email and give details of your new email address.
Using the words 'thank you for your patience' or 'Please' is polite and should be included as a part of your message.

This phrase is fairly formal, as you have requested. It’s basically a way of saying ‘Just letting you know I’ve changed my address - here’s the new one’.

To make note of something is to make sure you remember it.
We make note of the things we need to do, things that are important.

If you change your email address, contact details, your workplace or even place of residence, you can use the sentences above.

"I have a new residence address, please be sure to make note of my new address."
"My cell phone number has changed, please contact me on my new number."
"I am now working at a new location, please be sure to find me there."

Examples:

I wish to inform you of my new email address, you will receive all correspondence from me, from this email address in the future.

To whom it may concern: I have changed my email address to:. You can contact me on this email address from now on.

We need to keep in contact with people and it is easier these days than it was a long time ago. If we change our email address, it is a good idea to contact everybody on our contacts list and tell them that we have a new address. This is especially important if we are contacting people regularly, for example in a business situation.

This sentence is very polite and formal and can be used in business situations.
To "inform" means to notify or advise someone something. In this case, we want to notify someone or many people that we now have a new email address.

'I am emailing from my new email address when trying to reach me please make sure to use this email' this tells the person receiving the email that your new email is the one you are using right now to send the email

'My email has changed when trying to contact me please use the email I am emailing you from right now' this lets the email recipient know that your email has changed and the new email is the one you are emailing with right now

'My new address is:()please use this to contact me ' this informs the recipient of your new email

Both of these sentences are formal. they can both be used in formal situations.
If you are emailing from your new email address then you can say: Please take note of my new email address.
If you are using your old email address then say: Please be advised that my email address is now: - followed by your new email address.
This might be better as you won't run the risk of it going into someones 'junk' folder.

Here are three very easy ways to let someone know that you changed your email address. Notice that in the first two examples, they have a very similar structure but are simply changing the ordering of the sentence. The last example is simply stating that you now possess/have a new email.

When you want to inform someone (in a formal way) that you have changed your email address; then you may explain this in the following ways:
-I would like to inform you that my email address has changed. I can be reached by email on [insert new email address]
-Please take note that my email address has changed. I am available on [insert new email address]