Recently Microsoft has been updating their SSL Certificates on their mail servers causing problems with some MAILTOOL customers, mainly those who are behind in versions of MAILTOOL and/or not up to date on IBM i OS PTFs.
Please find below the steps you should take to ensure that you are up to date and to hopefully resolve this problem:
1. Make sure you are on the latest version of MAILTOOL. You can download the latest version from https://www.bvstools.com/mailtool.html. You can find the version you have installed looking in data area MAILTOOLV in the MAILTOOL library. If you do not have this data area in your MAILTOOL library you are certainly behind in versions and should update.
2. Make sure you are up on PTFs. PTFs are important for SSL communications because IBM controls the SSL cipher lists with these.
3. Make sure the data area MLTSSL01DA in library MAILTOOL is set to *NO (case sensitive). This will tell MAILTOOL to ignore any "Not trusted" (RC -23) SSL errors and eliminate the need to import CAs from new SSL certificates used Microsoft's eMail Servers.
4. Make sure the data area MLTSSL02DA is set to *GSKIT (case sensitive). This will tell MAILTOOL to use the GSKit SSL APIs vs the older IBM SSL APIs that IBM deems as "legacy" and no longer will be updated.
These errors appears to be happening randomly on only certain systems that are behind on PTFs or one or more of the above issues isn't met. This seems to happen every couple of years when Microsoft updates their SSL certificates. This is a good reason why everyone should stay as current as possible on our software versions as well as PTFs.
If you require new license keys after updating, please feel free to use the Quick Key option at https://www.bvstools.com to request temporary keys for MAILTOOL. You will be sent keys for MAILTOOL and MAILTOOL Plus which BOTH need to be applied. Once that is done, please forward to me (bvstone at bvstools dot com) the information from the DSPMCHINF command located in the MAILTOOL library. Please forward this information as text copied and pasted from the screen, not a screenshot or image.