Confusing warning during compilation: Warning: MATLAB preference entry "SMTP_Username" has been removed.
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I use sendmail in a compiled program that sends email via a generic gmail address. Username and password are set via:
When compiling with Compiler version: 8.1 (R2020b), I get the following warnings:
Warning: MATLAB preference entry "SMTP_Username" has been removed.
Warning: MATLAB preference entry "SMTP_Password" has been removed.
Still the code perfoms OK.
I don't really understand what this means, whether this is a feature that will be removed in future releases...
I could not find any information at mathworks or the internet in general. Any pointer is appreciated!
Mohammad Sami on 19 Jul 2021
Edited: Mohammad Sami on 19 Jul 2021
This is the correct behaviour for security reasons. Otherwise this information will be included from the previously set values in your Matlab environment if any. This would have happened regardless of whether you were using the mail function in your compiled program. These values would then have been exposed (visible in plain text) once you distribute your program to others.
Therefore you will need to use the setpref function in your code to set these values before you try to send the emails. You can also prompt the user for these values, then call the setpref function using the entered values.
Derek Wolfe on 1 Oct 2021
I ran into the same issue. My compile script uses the following to clear Internet preferences before building:
% clear email preferences
if (isempty(getpref('Internet')) == false)