diff --git a/management/backup.py b/management/backup.py
index 75046971..bd8e9f00 100755
--- a/management/backup.py
+++ b/management/backup.py
@@ -69,7 +69,7 @@ def backup_status(env):
 		# destination for the backups or the last backup job terminated unexpectedly.
 		raise Exception("Something is wrong with the backup: " + collection_status)
 	for line in collection_status.split('\n'):
-		if line.startswith(" full") or line.startswith(" inc"):
+		if line.startswith((" full", " inc")):
 			backup = parse_line(line)
 			backups[backup["date"]] = backup
 
diff --git a/management/dns_update.py b/management/dns_update.py
index c9e4d359..8afbd376 100755
--- a/management/dns_update.py
+++ b/management/dns_update.py
@@ -262,7 +262,7 @@ def build_zone(domain, domain_properties, additional_records, env, is_zone=True)
 	has_rec_base = list(records)
 	a_expl = "Required. May have a different value. Sets the IP address that %s resolves to for web hosting and other services besides mail. The A record must be present but its value does not affect mail delivery." % domain
 	if domain_properties[domain]["auto"]:
-		if domain.startswith("ns1.") or domain.startswith("ns2."): a_expl = False # omit from 'External DNS' page since this only applies if box is its own DNS server
+		if domain.startswith(("ns1.", "ns2.")): a_expl = False # omit from 'External DNS' page since this only applies if box is its own DNS server
 		if domain.startswith("www."): a_expl = "Optional. Sets the IP address that %s resolves to so that the box can provide a redirect to the parent domain." % domain
 		if domain.startswith("mta-sts."): a_expl = "Optional. MTA-STS Policy Host serving /.well-known/mta-sts.txt."
 		if domain.startswith("autoconfig."): a_expl = "Provides email configuration autodiscovery support for Thunderbird Autoconfig."
diff --git a/management/mailconfig.py b/management/mailconfig.py
index cfdc3239..3971f825 100755
--- a/management/mailconfig.py
+++ b/management/mailconfig.py
@@ -87,7 +87,7 @@ def prettify_idn_email_address(email):
 def is_dcv_address(email):
 	email = email.lower()
 	for localpart in ("admin", "administrator", "postmaster", "hostmaster", "webmaster", "abuse"):
-		if email.startswith(localpart+"@") or email.startswith(localpart+"+"):
+		if email.startswith((localpart + "@", localpart + "+")):
 			return True
 	return False