Sending email using sp_send_dbmail() does not work sometimes - sql-server

Question

I am sending notification email using SQL Server but sometimes emails aren't sent to users.
Here is my SQL table that I store emails which it will be sent to users
CREATE TABLE [dbo].[EmailNotification](
[Id] [INT] IDENTITY(1,1) NOT NULL,
[EmailAdress] [NVARCHAR](50) NULL,
[EmailBody] [NVARCHAR](500) NULL,
[EmailSubject] [NVARCHAR](250) NULL,
[Attachment] [NVARCHAR](500) NULL,
[EmailSent] [BIT] NULL CONSTRAINT [DF_EmailNotification_EmailSent] DEFAULT
((0)),
[EmailCreateDate] [DATETIME] NULL CONSTRAINT
[DF_EmailNotification_EmailCreateDate] DEFAULT (GETDATE()),
[EmailSentDate] [DATETIME] NULL,
CONSTRAINT [PK_EmailNotification] PRIMARY KEY CLUSTERED
([Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
And I have created a job which executes this procedure every 1 minute
CREATE PROCEDURE [dbo].[spSendEmail]
AS
BEGIN
BEGIN TRAN
DECLARE #id BIGINT
DECLARE #max_id BIGINT
DECLARE #query NVARCHAR(1000)
DECLARE #EmailBody NVARCHAR(1000)
DECLARE #EmailAdress NVARCHAR(500)
DECLARE #EmailSubject NVARCHAR(500)
DECLARE #attachments NVARCHAR(1000)
if exists (SELECT * FROM dbo.EmailNotification where EmailSent=0)
begin
SELECT #id=MIN(id) FROM dbo.EmailNotification where EmailSent=0
SELECT #EmailAdress=EmailAdress,#EmailBody=EmailBody,#EmailSubject=EmailSubject,#attachments=Attachment
FROM EmailNotification WHERE id = #id
exec [msdb].[dbo].[sp_send_dbmail] #profile_name='Notification',
#recipients=#EmailAdress,
#blind_copy_recipients='example.email.com',
#subject=#EmailSubject,
#body=#EmailBody,
#file_attachments=#attachments
end
IF(##ERROR>0)
BEGIN
ROLLBACK
END
ELSE
BEGIN
UPDATE EmailNotification set EmailSent=1, EmailSentDate=getdate() WHERE Id=#id
COMMIT
END

Answer 1

What do you mean : spSendEmail is not triggering sp_send_dbmail? sp_send_dbmail is triggered but doesn't do anything....?
Please get the return code of sp_send_dbmail :
0 => OK
<> 0 => Error occured
DECLARE #result int;
DECLARE #ErrorNb int;
EXECUTE #result = exec [msdb].[dbo].[sp_send_dbmail] #profile_name='EDMS email notification',
#recipients=#EmailAdress,
#blind_copy_recipients='example.email.com',
#subject=#EmailSubject,
#body=#EmailBody,
#file_attachments=#attachments
SET #ErrorNb = ##ERROR
IF #result <> 0
BEGIN
-- Something goes wrong
SELECT #result,#ErrorNb
END
You can also use TRY :
BEGIN TRY
EXECUTE exec [msdb].[dbo].[sp_send_dbmail] #profile_name='EDMS email notification',
#recipients=#EmailAdress,
#blind_copy_recipients='example.email.com',
#subject=#EmailSubject,
#body=#EmailBody,
#file_attachments=#attachments
END TRY
BEGIN CATCH
SELECT ERROR_MESSAGE();
END CATCH