Index: files/patch-imap__notify.c
diff -u -p /dev/null files/patch-imap__notify.c
--- /dev/null	2021-06-14 19:06:22.270449000 +0900
+++ files/patch-imap__notify.c	2021-06-14 17:31:13.634831000 +0900
@@ -0,0 +1,38 @@
+--- imap/notify.c.orig	2021-05-10 04:34:24 UTC
++++ imap/notify.c
+@@ -209,6 +209,27 @@ EXPORTED void notify(const char *method,
+                 FNAME_NOTIFY_SOCK, sizeof(sun_data.sun_path));
+     }
+ 
++#if defined(__FreeBSD__)
++    size_t maxsockbuf;
++    size_t len = sizeof(maxsockbuf);
++    r = sysctlbyname("kern.ipc.maxsockbuf", &maxsockbuf, &len, NULL, 0);
++    if (r == 0) {
++        bufsiz = MIN(maxsockbuf, NOTIFY_MAXSIZE);
++    } else {
++        syslog(LOG_WARNING,
++               "NOTIFY(%s): unable to sysctlbyname(kern.ipc.maxsockbuf): %m",
++               loginfo);
++        bufsiz = NOTIFY_MAXSIZE;
++    }
++
++    optlen = sizeof(bufsiz);
++    r = setsockopt(soc, SOL_SOCKET, SO_SNDBUF, &bufsiz, optlen);
++    if (r == -1) {
++        syslog(LOG_WARNING,
++               "NOTIFY(%s): unable to setsockopt(SO_SNDBUF) on socket: %m",
++               loginfo);
++    }
++#else
+     /* Get send buffer size */
+     optlen = sizeof(bufsiz);
+     r = getsockopt(soc, SOL_SOCKET, SO_SNDBUF, &bufsiz, &optlen);
+@@ -221,6 +242,7 @@ EXPORTED void notify(const char *method,
+ 
+     /* Use minimum of 1/10 of send buffer size (-overhead) NOTIFY_MAXSIZE */
+     bufsiz = MIN(bufsiz / 10 - 32, NOTIFY_MAXSIZE);
++#endif
+ 
+     /*
+      * build request of the form:
Index: files/patch-notifyd__notifyd.c
diff -u -p /dev/null files/patch-notifyd__notifyd.c
--- /dev/null	2021-06-14 19:06:22.274483000 +0900
+++ files/patch-notifyd__notifyd.c	2021-06-14 17:32:11.638265000 +0900
@@ -0,0 +1,32 @@
+--- notifyd/notifyd.c.orig	2021-05-05 03:21:59 UTC
++++ notifyd/notifyd.c
+@@ -111,6 +111,21 @@ static int do_notify(void)
+     unsigned bufsiz;
+     socklen_t optlen;
+ 
++#if defined(__FreeBSD__)
++    size_t maxsockbuf;
++    size_t len = sizeof(maxsockbuf);
++    if (sysctlbyname("kern.ipc.maxsockbuf", &maxsockbuf, &len, NULL, 0) == 0) {
++        bufsiz = MIN(maxsockbuf, NOTIFY_MAXSIZE);
++    } else {
++        syslog(LOG_WARNING, "unable to sysctlbyname(kern.ipc.maxsockbuf): %m");
++        bufsiz = NOTIFY_MAXSIZE;
++    }
++
++    optlen = sizeof(bufsiz);
++    if (setsockopt(soc, SOL_SOCKET, SO_RCVBUF, &bufsiz, optlen) == -1) {
++        syslog(LOG_WARNING, "unable to setsockopt(SO_RCVBUF) on notify socket: %m");
++    }
++#else
+     /* Get receive buffer size */
+     optlen = sizeof(bufsiz);
+     r = getsockopt(soc, SOL_SOCKET, SO_RCVBUF, &bufsiz, &optlen);
+@@ -121,6 +136,7 @@ static int do_notify(void)
+ 
+     /* Use minimum of 1/10 of receive buffer size (-overhead) NOTIFY_MAXSIZE */
+     bufsiz = MIN(bufsiz / 10 - 32, NOTIFY_MAXSIZE);
++#endif
+ 
+     while (1) {
+         method = class = priority = user = mailbox = message = reply = NULL;