in log4j-jakarta-smtp/src/main/java/org/apache/logging/log4j/smtp/MimeMessageBuilder.java [38:51]
public MimeMessageBuilder setFrom(final String from) throws MessagingException {
final InternetAddress address = parseAddress(from);
if (null != address) {
message.setFrom(address);
} else {
try {
message.setFrom();
} catch (final Exception ex) {
message.setFrom((InternetAddress) null);
}
}
return this;
}