We are using a commercial version of sendmail (refer to sendmail.com) on RHEL 5.x
We have seen something like 20000 mails sent to it within 5 mins & it just hung up or caused severe delay in delivery. Q1: Is postfix (which is now the default Smtp with RHEL 6.x) more robust ie can take bursts of high volumes & can handle huge attachments/mails with faster deliveries? Q2: In the past VA scans 5-10years ago, sendmail is always reported as something that should not be used. Does postfix has similar issue or it's not vulnerable to most VA scans today? Q3: Was told by our vendor that they set up 'commercial' version of sendmail which has a separate interface/module GUI for whitelisting & blacklisting. Is there a commercial version of 'postfix' which we can get official (eg: supported by RHEL) support with add-on user-friendly interfaces/GUI? If anyone can post a link/url that gave comparisons of the above 2 in the areas of stability, robustness & vulnerabilites, most appreciate it Roger
