An e-mail delivery problem

For many years, I have been using my IEEE alias e-mail address in the “From” line of outgoing messages and receiving replies back addressed to that alias. Recently, that doesn’t seem to work anymore. If I put ambertec@ieee.org into the “From” line, messages often do not get delivered, as in these three examples below.

Figure 1 Screenshots of several rejected emails when ambertec@ieee.org is used in the “From” field.
The techno-babble of these rejections is different in each case, but the end result is the same: My message was refused for delivery.
I can only reliably send messages now using jdunn4@optimum.net as the “From” entry because, in the interest of “security,” the “From” entry must now match the actual sending address. When I made them match in these three cases, all of the messages were successfully sent to their intended recipients.
This difficulty was first noticed a few months ago for one recipient of my messages, but this issue has spread like some kind of disease to other recipients as well. The utility of the IEEE alias itself has therefore been very much diminished.
John Dunn is an electronics consultant and a graduate of The Polytechnic Institute of Brooklyn (BSEE) and of New York University (MSEE).
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