2021.1

.on("change", function (event) {
var sender = event.target.value.trim(),
disabled = $(event.target).prop("disabled");
$senderName.prop("disabled", (disabled ||
!sender.length));
$useSender.prop("disabled", (disabled ||
!sender.length));
})
.trigger("change");
$host
.on("change", function (event) {
var host = event.target.value.trim();
$useAuth
.prop("disabled", !host.length)
.trigger("change");
$sender
.prop("disabled", !host.length)
.trigger("change");
$eml
.prop("disabled", host.length)
.trigger("change");
})
.trigger("change");
$eml
.on("change", function (event) {
if (!$host.val().trim().length)
$sender
.prop("disabled", !$(event.target).prop
("checked"))
.trigger("change");
})
.trigger("change");
$useAuth
.on("change", function (event) {
var checked = ($(event.target).prop("checked")),
disabled = ($(event.target).prop("disabled"));
$.each([$startTLS, $username, $password], function
(index, $element) {
$element.prop("disabled", (disabled ||
!checked));
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