Thank you for your reply.

In march I could use the gmail smtp server having a gmail account.

But I got the information that gmail has changed it's policy in may and that this isn't possible anymore.

 As far as I understand it, this means that a person using his e-mail client and on travel connects to some hotspot doesn't have the possibility anymore to reply his mails or sent new ones.

At home I use pmail without a problem. The internet options are configured for my ISP.

On holiday, up to beginning this year, I left my pop option for my ISP, but my smtp option  as the smtp server one of my gmail account and this worked.

 Now it don't work anymore. I am in Tenerife and as far as I can see, the free connection I have is from Telefonica.

A few weeks ago being in Switzerland I had the same problem, the gmail trick didn't work. But fortunately, being on swisscom, I could find the correct smtp settings and could sent out mail.

Here for Telefonica I found the setting for the smtp server, but authentication is needed. Being on a free connection I don't have this information.

Therefor I was wondering if I could install mercury on my machine and use it to sent out the mail from pmail.

Thanks in advance

That won't help if Mercury is on the same machine as Pmail, as SMTP will be still restricted by the provider.

You should be able to use an alternate submission port for gmail from most places (587 from memory) but again this depends on the policy of each network provider.