how to change a "spam"mail to a normal mail in order to be able to reply to it??

the mail was no spam mail.  My reply to that mail was refused to be sent.  Very inconventient.  Now I have to ask that person to send mails to me to my gmail account…
How can a mail, you put in the spambox, be changed to a normal mail?

Right-click on the message in the spam folder and choose Move to Inbox > Move to Inbox and remove blacklisted email. Once it is in your Inbox you can reply to it as normal without having to have it resent to you.

If messages from that person appear again in the spam folder, then it will be because of action taken by your mail server. You will have to investigate with them how to remove the address permanently from the spam filter.

Thanks for the information.   Problem has been solved.