diff --git a/lib/api/mailboxes.js b/lib/api/mailboxes.js
index 30210164..327c37c5 100644
--- a/lib/api/mailboxes.js
+++ b/lib/api/mailboxes.js
@@ -6,7 +6,7 @@ const imapTools = require('../../imap-core/lib/imap-tools');
 const tools = require('../tools');
 const roles = require('../roles');
 const util = require('util');
-const { sessSchema, sessIPSchema, booleanSchema } = require('../schemas');
+const { sessSchema, sessIPSchema, booleanSchema, mailboxPathValidator } = require('../schemas');
 const { userId, mailboxId } = require('../schemas/request/general-schemas');
 const { successRes } = require('../schemas/response/general-schemas');
 const { GetMailboxesResult } = require('../schemas/response/mailboxes-schemas');
@@ -283,23 +283,7 @@ module.exports = (db, server, mailboxHandler) => {
                     path: Joi.string()
                         .regex(/\/{2,}|\/$/, { invert: true })
                         .max(MAX_MAILBOX_NAME_LENGTH * MAX_SUB_MAILBOXES + 127)
-                        .custom((value, helpers) => {
-                            const splittedPathArr = value.split('/');
-
-                            if (splittedPathArr.length > MAX_SUB_MAILBOXES) {
-                                // too many paths
-                                return helpers.message(`The mailbox path cannot be more than ${MAX_SUB_MAILBOXES} levels deep`);
-                            }
-
-                            for (const pathPart of splittedPathArr) {
-                                if (pathPart.length > MAX_MAILBOX_NAME_LENGTH) {
-                                    // part too long error
-                                    return helpers.message(`Any part of the mailbox path cannot be longer than ${MAX_MAILBOX_NAME_LENGTH} chars long`);
-                                }
-                            }
-
-                            return value;
-                        }, 'Mailbox path validation')
+                        .custom(mailboxPathValidator, 'Mailbox path validation')
                         .required()
                         .description('Full path of the mailbox, folders are separated by slashes, ends with the mailbox name (unicode string)'),
                     hidden: booleanSchema.default(false).description('Is the folder hidden or not. Hidden folders can not be opened in IMAP.'),
@@ -559,23 +543,7 @@ module.exports = (db, server, mailboxHandler) => {
                     path: Joi.string()
                         .regex(/\/{2,}|\/$/, { invert: true })
                         .max(MAX_MAILBOX_NAME_LENGTH * MAX_SUB_MAILBOXES + 127)
-                        .custom((value, helpers) => {
-                            const splittedPathArr = value.split('/');
-
-                            if (splittedPathArr.length > MAX_SUB_MAILBOXES) {
-                                // too many paths
-                                return helpers.message(`The mailbox path cannot be more than ${MAX_SUB_MAILBOXES} levels deep`);
-                            }
-
-                            for (const pathPart of splittedPathArr) {
-                                if (pathPart.length > MAX_MAILBOX_NAME_LENGTH) {
-                                    // part too long error
-                                    return helpers.message(`Any part of the mailbox path cannot be longer than ${MAX_MAILBOX_NAME_LENGTH} chars long`);
-                                }
-                            }
-
-                            return value;
-                        }, 'Mailbox path validation')
+                        .custom(mailboxPathValidator, 'Mailbox path validation')
                         .description('Full path of the mailbox, use this to rename an existing Mailbox'),
                     retention: Joi.number()
                         .empty('')
diff --git a/lib/schemas.js b/lib/schemas.js
index 9da57058..41c0e80a 100644
--- a/lib/schemas.js
+++ b/lib/schemas.js
@@ -2,6 +2,7 @@
 
 const EJSON = require('mongodb-extended-json');
 const Joi = require('joi');
+const { MAX_SUB_MAILBOXES, MAX_MAILBOX_NAME_LENGTH } = require('./consts');
 
 const sessSchema = Joi.string().max(255).label('Session identifier').description('Session identifier for the logs');
 const sessIPSchema = Joi.string()
@@ -82,6 +83,24 @@ const metaDataValidator = () => (value, helpers) => {
     return strValue;
 };
 
+const mailboxPathValidator = (value, helpers) => {
+    const splittedPathArr = value.split('/');
+
+    if (splittedPathArr.length > MAX_SUB_MAILBOXES) {
+        // too many paths
+        return helpers.message(`The mailbox path cannot be more than ${MAX_SUB_MAILBOXES} levels deep`);
+    }
+
+    for (const pathPart of splittedPathArr) {
+        if (pathPart.length > MAX_MAILBOX_NAME_LENGTH) {
+            // part too long error
+            return helpers.message(`Any part of the mailbox path cannot be longer than ${MAX_MAILBOX_NAME_LENGTH} chars long`);
+        }
+    }
+
+    return value;
+};
+
 const mongoCursorSchema = Joi.string().trim().empty('').custom(mongoCursorValidator({}), 'Cursor validation').max(1024);
 const pageLimitSchema = Joi.number().default(20).min(1).max(250).label('Page size');
 const pageNrSchema = Joi.number().default(1).label('Page number').description('Current page number. Informational only, page numbers start from 1');
@@ -111,5 +130,6 @@ module.exports = {
     pageLimitSchema,
     booleanSchema,
     metaDataSchema,
-    usernameSchema
+    usernameSchema,
+    mailboxPathValidator
 };