You have Emmesmail installed on your laptop computer which you are travelling with.
Can you use your notebook to retrieve and send email? Of course!!
To read your email: Connect to the Internet and proceed as you usually do.
To be able to send email (or reply): All you need to do is find out the name (URL) of the SMTP server for the ISP you are using to connect to the Internet and configure Emmesmail with this information.
In order to retrieve email when away from home, all you need to do is to connect your computer to the Internet. This generally requires that someone let you use their account with their ISP provider. Once you are logged in to their account, you may retrieve mail using Emmesmail exactly as you would at home.
In order to send emails, you will need to know the address of the SMTP server for the account you are logged in to. Once you know this, you need to inform Emmesmail. You are now ready to send emails just as you did from home.
Your POP3 mail server can be accessed from anywhere in the world, provided you know its address and the username and password for the account. You will have provided this information to Emmesmail when you first started using it at home.
Your usual SMTP (mail-sending) server also may be accessed from anywhere in the world and isn't even password-protected. However, almost all SMTP servers require the sender of the email to be a bone fide user on the network connection used to send the email.
In simpler terms: According to the SMTP protocol followed by all responsible ISPs, you cannot be logged on to one ISP and use another ISP's SMTP server to send mail. This is in order to make it more difficult to send untraceable spam.
In simpler terms still, this means that when you are away from home and use an ISP that is not your own, you must use that service provider's SMTP server to send your email.