diff --git a/management/dns_update.py b/management/dns_update.py
index f2cf5eef..81e754e0 100755
--- a/management/dns_update.py
+++ b/management/dns_update.py
@@ -48,6 +48,11 @@ def get_dns_zones(env):
 
 	return zonefiles
 	
+def get_custom_dns_config(env):
+	try:
+		return rtyaml.load(open(os.path.join(env['STORAGE_ROOT'], 'dns/custom.yaml')))
+	except:
+		return { }
 
 def do_dns_update(env):
 	# What domains (and their zone filenames) should we build?
@@ -55,10 +60,7 @@ def do_dns_update(env):
 	zonefiles = get_dns_zones(env)
 
 	# Custom records to add to zones.
-	try:
-		additional_records = rtyaml.load(open(os.path.join(env['STORAGE_ROOT'], 'dns/custom.yaml')))
-	except:
-		additional_records = { }
+	additional_records = get_custom_dns_config(env)
 
 	# Write zone files.
 	os.makedirs('/etc/nsd/zones', exist_ok=True)
diff --git a/management/web_update.py b/management/web_update.py
index 63b67cf3..5e4b09b4 100644
--- a/management/web_update.py
+++ b/management/web_update.py
@@ -5,17 +5,32 @@
 import os, os.path, re, rtyaml
 
 from mailconfig import get_mail_domains
+from dns_update import get_custom_dns_config
 from utils import shell, safe_domain_name, sort_domains
 
 def get_web_domains(env):
-	# What domains should we serve HTTP/HTTPS for?
+	# What domains should we serve websites for?
 	domains = set()
 
-	# Add all domain names in use by email users and mail aliases.
+	# At the least it's the PRIMARY_HOSTNAME so we can serve webmail
+	# as well as Z-Push for Exchange ActiveSync.
+	domains.add(env['PRIMARY_HOSTNAME'])
+
+	# Also serve web for all mail domains so that we might at least
+	# provide Webfinger and ActiveSync auto-discover of email settings
+	# (though the latter isn't really working). These will require that
+	# an SSL cert be installed.
 	domains |= get_mail_domains(env)
 
-	# Ensure the PRIMARY_HOSTNAME is in the list.
-	domains.add(env['PRIMARY_HOSTNAME'])
+	# ...Unless the domain has an A/AAAA record that maps it to a different
+	# IP address than this box. Remove those domains from our list.
+	dns = get_custom_dns_config(env)
+	for domain, value in dns.items():
+		if domain not in domains: continue
+		if (isinstance(value, str) and (value != "local")) \
+		  or (isinstance(value, dict) and ("A" in value) and (value["A"] != "local")) \
+		  or (isinstance(value, dict) and ("AAAA" in value) and (value["AAAA"] != "local")):
+			domains.remove(domain)
 
 	# Sort the list. Put PRIMARY_HOSTNAME first so it becomes the
 	# default server (nginx's default_server).
@@ -23,7 +38,6 @@ def get_web_domains(env):
 
 	return domains
 	
-
 def do_web_update(env):
 	# Build an nginx configuration file.
 	nginx_conf = ""
diff --git a/management/whats_next.py b/management/whats_next.py
index e97dce5e..1061f8b9 100755
--- a/management/whats_next.py
+++ b/management/whats_next.py
@@ -66,11 +66,8 @@ def run_domain_checks(env):
 		if domain in mail_domains:
 			check_mail_domain(domain, env)
 
-		if domain == env["PRIMARY_HOSTNAME"] or domain in web_domains: 
-			# We need a SSL certificate for PRIMARY_HOSTNAME because that's where the
-			# user will log in with IMAP or webmail. Any other domain we serve a
-			# website for also needs a signed certificate.
-			check_ssl_cert(domain, env)
+		if domain in web_domains:
+			check_web_domain(domain, env)
 
 		print()
 
@@ -128,18 +125,6 @@ def check_dns_zone(domain, env, dns_zonefiles):
 			control panel to set the nameservers to %s."""
 				% (existing_ns, correct_ns) )
 
-	# See if the domain's A record resolves to our PUBLIC_IP. This is already checked
-	# for PRIMARY_HOSTNAME, for which it is required. For other domains it is just nice
-	# to have if we want web.
-	if domain != env['PRIMARY_HOSTNAME']:
-		ip = query_dns(domain, "A")
-		if ip == env['PUBLIC_IP']:
-			print_ok("Domain resolves to this box's IP address. [%s => %s]" % (domain, env['PUBLIC_IP']))
-		else:
-			print_error("""This domain should resolve to your box's IP address (%s) if you would like the box to serve
-				webmail or a website on this domain. The domain currently resolves to %s in public DNS. It may take several hours for
-				public DNS to update after a change. This problem may result from other issues listed here.""" % (env['PUBLIC_IP'], ip))
-
 	# See if the domain has a DS record set.
 	ds = query_dns(domain, "DS", nxdomain=None)
 	ds_correct = open('/etc/nsd/zones/' + dns_zonefiles[domain] + '.ds').read().strip()
@@ -198,6 +183,24 @@ def check_mail_domain(domain, env):
 	# Check that the postmaster@ email address exists.
 	check_alias_exists("postmaster@" + domain, env)
 
+def check_web_domain(domain, env):
+	# See if the domain's A record resolves to our PUBLIC_IP. This is already checked
+	# for PRIMARY_HOSTNAME, for which it is required for mail specifically. For it and
+	# other domains, it is required to access its website.
+	if domain != env['PRIMARY_HOSTNAME']:
+		ip = query_dns(domain, "A")
+		if ip == env['PUBLIC_IP']:
+			print_ok("Domain resolves to this box's IP address. [%s => %s]" % (domain, env['PUBLIC_IP']))
+		else:
+			print_error("""This domain should resolve to your box's IP address (%s) if you would like the box to serve
+				webmail or a website on this domain. The domain currently resolves to %s in public DNS. It may take several hours for
+				public DNS to update after a change. This problem may result from other issues listed here.""" % (env['PUBLIC_IP'], ip))
+
+	# We need a SSL certificate for PRIMARY_HOSTNAME because that's where the
+	# user will log in with IMAP or webmail. Any other domain we serve a
+	# website for also needs a signed certificate.
+	check_ssl_cert(domain, env)
+
 def query_dns(qname, rtype, nxdomain='[Not Set]'):
 	resolver = dns.resolver.get_default_resolver()
 	try: