There is no option on the web site to allow any adjustment
Unless you communicate with Airnav and advise them of your concern they will not be able to take any action to alleviate it
Therefore if receiving an email is an issue for you I would suggest you contact them with a suggestion as I advised previously
I have seen users of other sites asking why did you not tell me it was offline!!! They only found out something was wrong when they got downgraded for being offline
Alan