diff --git a/epicyon.py b/epicyon.py
index edb04cbf..3a1d5278 100644
--- a/epicyon.py
+++ b/epicyon.py
@@ -15,6 +15,7 @@ from person import deactivateAccount
 from skills import setSkillLevel
 from roles import setRole
 from webfinger import webfingerHandle
+from posts import checkDomains
 from posts import getPublicPostDomains
 from posts import getPublicPostDomainsBlocked
 from posts import sendBlockViaServer
@@ -162,6 +163,10 @@ parser.add_argument('--postDomainsBlocked', dest='postDomainsBlocked',
                     type=str, default=None,
                     help='Show blocked domains referenced in public '
                     'posts for the given handle')
+parser.add_argument('--checkDomains', dest='checkDomains', type=str,
+                    default=None,
+                    help='Check domains of non-mutual followers for '
+                    'domains which are globally blocked by this instance')
 parser.add_argument('--socnet', dest='socnet', type=str,
                     default=None,
                     help='Show dot diagram for social network '
@@ -520,6 +525,44 @@ if args.postDomainsBlocked:
         print(postDomain)
     sys.exit()
 
+if args.checkDomains:
+    # Domains which were referenced in public posts by a
+    # given handle but which are globally blocked on this instance
+    if '@' not in args.checkDomains:
+        if '/users/' in args.checkDomains:
+            postsNickname = getNicknameFromActor(args.posts)
+            postsDomain, postsPort = getDomainFromActor(args.posts)
+            args.checkDomains = postsNickname + '@' + postsDomain
+            if postsPort:
+                if postsPort != 80 and postsPort != 443:
+                    args.checkDomains += ':' + str(postsPort)
+        else:
+            print('Syntax: --checkDomains nickname@domain')
+            sys.exit()
+    if not args.http:
+        args.port = 443
+    nickname = args.checkDomains.split('@')[0]
+    domain = args.checkDomains.split('@')[1]
+    proxyType = None
+    if args.tor or domain.endswith('.onion'):
+        proxyType = 'tor'
+        if domain.endswith('.onion'):
+            args.port = 80
+    elif args.i2p or domain.endswith('.i2p'):
+        proxyType = 'i2p'
+        if domain.endswith('.i2p'):
+            args.port = 80
+    elif args.gnunet:
+        proxyType = 'gnunet'
+    maxBlockedDomains = 2
+    checkDomains(None,
+                 baseDir, nickname, domain,
+                 proxyType, args.port,
+                 httpPrefix, debug,
+                 __version__,
+                 maxBlockedDomains, False)
+    sys.exit()
+
 if args.socnet:
     if ',' not in args.socnet:
         print('Syntax: '
diff --git a/posts.py b/posts.py
index 8f735516..4218dbec 100644
--- a/posts.py
+++ b/posts.py
@@ -14,6 +14,7 @@ import shutil
 import sys
 import time
 import uuid
+import random
 from socket import error as SocketError
 from time import gmtime, strftime
 from collections import OrderedDict
@@ -59,6 +60,7 @@ from filters import isFiltered
 from git import convertPostToPatch
 from jsonldsig import jsonldSign
 from petnames import resolvePetnames
+from follow import getNonMutualsOfPerson
 # try:
 #     from BeautifulSoup import BeautifulSoup
 # except ImportError:
@@ -3330,6 +3332,57 @@ def getPublicPostDomainsBlocked(session, baseDir: str,
     return blockedDomains
 
 
+def checkDomains(session, baseDir: str,
+                 nickname: str, domain: str,
+                 proxyType: str, port: int, httpPrefix: str,
+                 debug: bool, projectVersion: str,
+                 maxBlockedDomains: int, singleCheck: bool):
+    """Checks follower accounts for references to globally blocked domains
+    """
+    nonMutuals = getNonMutualsOfPerson(baseDir, nickname, domain)
+    if not nonMutuals:
+        return
+    followerWarningFilename = baseDir + '/accounts/followerWarnings.txt'
+    updateFollowerWarnings = False
+    followerWarningStr = ''
+    if os.path.isfile(followerWarningFilename):
+        with open(followerWarningFilename, 'r') as fp:
+            followerWarningStr = fp.read()
+
+    if singleCheck:
+        # checks a single random non-mutual
+        index = random.randrange(0, len(nonMutuals))
+        domainName = nonMutuals[index]
+        blockedDomains = \
+            getPublicPostDomainsBlocked(session, baseDir,
+                                        nickname, domain,
+                                        proxyType, port, httpPrefix,
+                                        debug, projectVersion, [])
+        if blockedDomains:
+            if len(blockedDomains) > maxBlockedDomains:
+                followerWarningStr += domainName + '\n'
+                updateFollowerWarnings = True
+    else:
+        # checks all non-mutuals
+        for domainName in nonMutuals:
+            if domainName in followerWarningStr:
+                continue
+            blockedDomains = \
+                getPublicPostDomainsBlocked(session, baseDir,
+                                            nickname, domain,
+                                            proxyType, port, httpPrefix,
+                                            debug, projectVersion, [])
+            if blockedDomains:
+                if len(blockedDomains) > maxBlockedDomains:
+                    followerWarningStr += domainName + '\n'
+                    updateFollowerWarnings = True
+
+    if updateFollowerWarnings and followerWarningStr:
+        with open(followerWarningFilename, 'w+') as fp:
+            fp.write(followerWarningStr)
+        print(followerWarningStr)
+
+
 def sendCapabilitiesUpdate(session, baseDir: str, httpPrefix: str,
                            nickname: str, domain: str, port: int,
                            followerUrl, updateCaps: [],